Nothing to be fixed. And I do not believe the governor lag ( we are speaking of at most 200 rpm difference during the deceleration) would effect the maneuver.
HiTech
It's a mystery then. Fixed prop flies the same, constant pitch is different. The snap roll decreases RPM now with constant speed props and the snap roll result is different for some unknown reason.
I thought the same thing with the P-38. HTC has posted that the model has not changed. I think what the problem is the video processing, and sounds are different. What sounds we expected to hear and the look on the screen at the moment you add rudder as an example are just not the same look and sound as ah2.
That would not cause the change in post departure gyrations. The difference is the forces expressed after you stall one wing.
Edit: Did some testing. The P-38 drops 500 RPM in a snap roll but the single engine change is much less.
I did get the P-47M and eventually the F4UA-1 to fly backwards so I must have been doing something differently, probably flaps, when they wouldn't rotate before.