caculation of off-design points for mixed-turbofan

[NJC1012]

The first is how to control whether it is in the afterforce state, and the second is that T4 must be used as the control variable when calculating at non-design points? Because I have tried to add HPC efficiency or N2 without commenting on it, it has no effect on the result, but after commenting on T4, the calculation will no longer converge. Can't you just change the efficiency at the design point to see the change in thrust? To determine the effect of efficiency on thrust, but it seems that an exact efficiency cannot be set in off-design mode. Finally, MAP scaling and correction.
I already know the calculation principle, but the implementation is confusing. Could you please give me a specific PYCYCLE scaling example? Because I see that the engine model example provided does not have this part. T
hank you very much for the help, no guidance, very painful, so can only ask for help. I hope someone can answer my question, thank you very much.