Engine dies on hard stop when downshifting

[KillboyPowerhead]

Hello Gen V cohorts,

I'm tuning a 2015 Camaro V6 (E39A ECU, believe is a Gen V or equivalent), and after a few years of everything working just fine I decided to clean the throttle body, and since then the engine has had a tendency to die when making a harder-than-typical stop when downshifting - no issues if not downshifting (this is an auto and I use the manual mode/paddle shifters exclusively). Went through the throttle relearn procedure (and used the "throttle clean" feature in the Scanner) and the RPM's are fine on start-up/idle - RPM's stay constant/no hunting).

I first adjusted the VVE cells in the relevant cells/zones because I saw the STFT's highly positive, but no difference. Then increased by 50% the relevant cells in the Speed Control Reserve table [33720] which seemed to help the stalling on the normal stops (downshifting from 3rd to 2nd starting at 30 - 40 km/h) but didn't help with the harder stops (as in downshifting from 4th to 3rd to 2nd starting at 50 - 60 km/h). Then set table 33720 back to stock (want to try one thing at a time) and increased by 50% the cells in the Follower > Immediate table [33619] which also did not help the harder stops.

Attached is my current tune with both of the above changes active (haven't tested with both active yet); I'm still trying things, but figured I'd post this in the meantime in case I can't figure it out any time soon. I see that the Predicted Axle Torque Source changes from Idle to Axle then to Idle again due to the downshift, and also see that the Throttle Control Source goes from "Torque" to "Min Pos" just before it stalls (stall happens at 21:50 in the log).

Any assistance would be much appreciated!

Post throttle clean 8.hpt
Stall 2.hpl

[KillboyPowerhead]

Looks like I may have just had to further increase the Idle Speed Control Reserve (table 33720; Engine > Idle > Torque); seems to be handling the harder stops better, throttle is staying more open instead of nearly closing. Had increased the relevant cells by 50% which seemed to have helped the softer/normal stops, but after doubling those cells (from stock) the harder stops are better too. Will revert the other changes to make sure that this is the only table that needs adjusted...