I did fly the test in different load configurations and with different flap settings and with gear up and down. Also different fuel loads. No difference in the result. I posted the load outs for the film that I published.
ok, just made a film testing P-38L 75% fuel loadout 2 1K bombs and 10 rkts
power off stall at 5,000 ft gear up / no flaps used (I did use flaps on 1 of the spins, I let the spin really spin 3 rotations before trying to recover, and got really close to ground so used flaps to keep from pancaking)
cut throttle, full stick backpressure full righ t rudder to induce spin
to recover - full stick forward , full left rudder to counter spin, spin stops increase throtttle to pull out
did it several times
did the spin to the left several times as well. I had no problems. I did not have to use an small amount of throttle on right engine only.
are you using combat trim? I was using manual trim , trimmed out to level flight speed of 300 mph ias
I need to find place to host this film
Viper