My heart goes out to your P-51. (Not you, the plane!
I just started eflight a year ago on a Pico Stick and TM, and am currently learning ailerons using a Rear Bear. (And to prove it, I tore a wing off the RB second-last time out!) I also have a half built P-51, so I feel your pain.
May I humbly suggest trying 50% dual rates, and laying off the rolls until you have a least 2 successful flights!