I had a JKA P-51B with a norvel .15 and it was awful to fly...until I realized that I had left thrust in my motor and the ailerons were set a little down (like flaps). I would hand launch and it would violently snap left almost immediatly. I added 5 degrees right thrust and a little more down thrust, also added some reflex (raised the ailerons 3 degrees in an up flap position) and it flew great!!! I now have a JKA Mig 3 with .25 and did the same thing to it. It flies hands off/on or upside down with no bad habits at all. I also used micro radio gear to make the wing loading real light so slow speed is also predictable with no snap happy tendencies.

I have two whole pages dedicated to warbird related material including AVI videos of launching and landing these little planes at www.nearc.rcclubs.com