diff --git a/src/claim.rs b/src/claim.rs
index 12ca607..e7242ad 100644
--- a/src/claim.rs
+++ b/src/claim.rs
@@ -72,7 +72,7 @@ impl Miner {
 
         // Send and confirm
         ixs.push(ore_api::instruction::claim(pubkey, beneficiary, amount));
-        self.send_and_confirm(&ixs, ComputeBudget::Fixed(CU_LIMIT_CLAIM), false)
+        self.send_and_confirm(&ixs, ComputeBudget::Fixed(CU_LIMIT_CLAIM), false, None)
             .await
             .ok();
     }
@@ -99,7 +99,7 @@ impl Miner {
             &ore_api::consts::MINT_ADDRESS,
             &spl_token::id(),
         );
-        self.send_and_confirm(&[ix], ComputeBudget::Dynamic, false)
+        self.send_and_confirm(&[ix], ComputeBudget::Dynamic, false, None)
             .await
             .ok();
 
diff --git a/src/close.rs b/src/close.rs
index 72695df..9af5f38 100644
--- a/src/close.rs
+++ b/src/close.rs
@@ -37,7 +37,7 @@ impl Miner {
 
         // Submit close transaction
         let ix = ore_api::instruction::close(signer.pubkey());
-        self.send_and_confirm(&[ix], ComputeBudget::Dynamic, false)
+        self.send_and_confirm(&[ix], ComputeBudget::Dynamic, false, None)
             .await
             .ok();
     }
diff --git a/src/mine.rs b/src/mine.rs
index c773f7f..4408b9e 100644
--- a/src/mine.rs
+++ b/src/mine.rs
@@ -117,7 +117,12 @@ impl Miner {
             //     .await
             //     .ok();
             if self
-                .send_and_confirm(&ixs, ComputeBudget::Fixed(compute_budget), false)
+                .send_and_confirm(
+                    &ixs,
+                    ComputeBudget::Fixed(compute_budget),
+                    false,
+                    Some(solution.to_hash().difficulty()),
+                )
                 .await
                 .is_ok()
             {
@@ -180,9 +185,24 @@ impl Miner {
                             if nonce % 100 == 0 {
                                 if timer.elapsed().as_secs().ge(&cutoff_time) {
                                     if best_difficulty.ge(&min_difficulty) {
-                                        // Mine until min difficulty has been met
-                                        break;
-                                    }
+                                        if best_difficulty >= 18 {
+                                            // Mine until min difficulty has been met
+                                            break;
+                                        } else {
+                                            // delay extra 30 secs
+                                            progress_bar.set_message(format!(
+                                                "Mining... ({} sec surpassed)",
+                                                timer.elapsed().as_secs().saturating_sub(cutoff_time),
+                                            ));
+                                            if timer
+                                                .elapsed()
+                                                .as_secs()
+                                                .ge(&cutoff_time.saturating_add(29))
+                                            {
+                                                break;
+                                            }
+                                        }
+                                    } 
                                 } else if i.id == 0 {
                                     progress_bar.set_message(format!(
                                         "Mining... ({} sec remaining)",
@@ -267,8 +287,23 @@ impl Miner {
                             if nonce % 100 == 0 {
                                 if timer.elapsed().as_secs().ge(&cutoff_time) {
                                     if best_difficulty.ge(&min_difficulty) {
-                                        // Mine until min difficulty has been met
-                                        break;
+                                        if best_difficulty >= 18 {
+                                            // Mine until min difficulty has been met
+                                            break;
+                                        } else {
+                                            // delay extra 30 secs
+                                            progress_bar.set_message(format!(
+                                                "Mining... ({} sec surpassed)",
+                                                timer.elapsed().as_secs().saturating_sub(cutoff_time),
+                                            ));
+                                            if timer
+                                                .elapsed()
+                                                .as_secs()
+                                                .ge(&cutoff_time.saturating_add(29))
+                                            {
+                                                break;
+                                            }
+                                        }
                                     }
                                 } else if i == 0 {
                                     progress_bar.set_message(format!(
diff --git a/src/open.rs b/src/open.rs
index 640b9c9..8761975 100644
--- a/src/open.rs
+++ b/src/open.rs
@@ -15,7 +15,7 @@ impl Miner {
         // Sign and send transaction.
         println!("Generating challenge...");
         let ix = ore_api::instruction::open(signer.pubkey(), signer.pubkey(), fee_payer.pubkey());
-        self.send_and_confirm(&[ix], ComputeBudget::Dynamic, false)
+        self.send_and_confirm(&[ix], ComputeBudget::Dynamic, false, None)
             .await
             .ok();
     }
diff --git a/src/send_and_confirm.rs b/src/send_and_confirm.rs
index 44ef30c..88c33e4 100644
--- a/src/send_and_confirm.rs
+++ b/src/send_and_confirm.rs
@@ -41,6 +41,7 @@ impl Miner {
         ixs: &[Instruction],
         compute_budget: ComputeBudget,
         skip_confirm: bool,
+        difficulty: Option<u32>, // MI
     ) -> ClientResult<Signature> {
         let signer = self.signer();
         let client = self.rpc_client.clone();
@@ -90,8 +91,19 @@ impl Miner {
                 // Reset the compute unit price
                 if self.dynamic_fee {
                     let fee = if let Some(fee) = self.dynamic_fee().await {
-                        progress_bar.println(format!("  Priority fee: {} microlamports", fee));
-                        fee
+                        let mut prio_fee = fee;
+                        // MI: upbound 300K for diff > 21
+                        if let Some(difficulty) = difficulty {
+                            if difficulty > 21 {
+                                prio_fee =
+                                    300_000.min(prio_fee.saturating_mul(15).saturating_div(10));
+                            } else if difficulty < 18 {
+                                // prio_fee = 5000.max(prio_fee.saturating_mul(2).saturating_div(3));
+                                // keep priority fee recommendation
+                            }
+                        }
+                        progress_bar.println(format!("  Priority fee: {} microlamports", prio_fee));
+                        prio_fee
                     } else {
                         let fee = self.priority_fee.unwrap_or(0);
                         progress_bar.println(format!("  {} Dynamic fees not supported by this RPC. Falling back to static value: {} microlamports", "WARNING".bold().yellow(), fee));
diff --git a/src/stake.rs b/src/stake.rs
index a820040..322cb81 100644
--- a/src/stake.rs
+++ b/src/stake.rs
@@ -36,7 +36,7 @@ impl Miner {
 
         // Send tx
         let ix = ore_api::instruction::stake(signer.pubkey(), sender, amount);
-        self.send_and_confirm(&[ix], ComputeBudget::Fixed(CU_LIMIT_CLAIM), false)
+        self.send_and_confirm(&[ix], ComputeBudget::Fixed(CU_LIMIT_CLAIM), false, None)
             .await
             .ok();
     }
diff --git a/src/upgrade.rs b/src/upgrade.rs
index ca4fef1..f40c0a8 100644
--- a/src/upgrade.rs
+++ b/src/upgrade.rs
@@ -40,7 +40,7 @@ impl Miner {
 
         let ix = ore_api::instruction::upgrade(signer.pubkey(), beneficiary, sender, amount);
         match self
-            .send_and_confirm(&[ix], ComputeBudget::Fixed(CU_LIMIT_UPGRADE), false)
+            .send_and_confirm(&[ix], ComputeBudget::Fixed(CU_LIMIT_UPGRADE), false, None)
             .await
         {
             Ok(_sig) => {}
@@ -105,7 +105,7 @@ impl Miner {
                 &ore_api::consts::MINT_ADDRESS,
                 &spl_token::id(),
             );
-            self.send_and_confirm(&[ix], ComputeBudget::Dynamic, false)
+            self.send_and_confirm(&[ix], ComputeBudget::Dynamic, false, None)
                 .await
                 .ok();
         }