diff --git a/src/sentry/grouping/ingest/config.py b/src/sentry/grouping/ingest/config.py
index 1a1572b2b507a9..6951b4cc825826 100644
--- a/src/sentry/grouping/ingest/config.py
+++ b/src/sentry/grouping/ingest/config.py
@@ -99,5 +99,6 @@ def project_uses_optimized_grouping(project: Project) -> bool:
             project.organization,
         )
         or (is_in_transition(project))
-        or project.id % 5 < 4  # 80% of all non-transition projects
+        # TODO: Yes, this is everyone - this check will soon be removed entirely
+        or project.id % 5 < 5  # 100% of all non-transition projects
     )
diff --git a/tests/sentry/event_manager/grouping/test_assign_to_group.py b/tests/sentry/event_manager/grouping/test_assign_to_group.py
index ac609f16f13ec0..9470707cb0f42e 100644
--- a/tests/sentry/event_manager/grouping/test_assign_to_group.py
+++ b/tests/sentry/event_manager/grouping/test_assign_to_group.py
@@ -518,7 +518,7 @@ def test_uses_regular_or_optimized_grouping_as_appropriate(
         # Keep making projects until we get an id which matches `id_qualifies`
         org = Factories.create_organization()
         project = Factories.create_project(organization=org)
-        while (project.id % 5 >= 4) if id_qualifies else (project.id % 5 < 4):
+        while (project.id % 5 >= 5) if id_qualifies else (project.id % 5 < 5):
             project = Factories.create_project(organization=org)
 
     with (