Earl, could you please try hard maneuvering in the '38 and let me know what you find?
Something happens for me in the 38s that doesn't happen in other twins; I'm still testing and comparing. Basically the engine pitch varies wildly and the plane becomes hard to control when I do high G maneuvers. I tried this in the Bf110 yesterday and did experience any of the same issues. FLS says its the result of the new prop model.
EDIT: I can duplicate this now in the Bf110c. Got airspeed to 300 and initiated a scissors, pulling to blackout in each direction, letting up a bit, then reversing. Takes about 3 before plane's engine rpm is fluctuating pretty badly.
I haven't noticed the rpm fluctuation in single engine fighters though; will keep testing.