Did mess around with the mixes for knife edge but wasnt really worth it I thought. I just use snap flapperons to help stop the wing rock. really want to do twin elevator setup though dont like the closed loop system.

Try 13*4WAPC and 12.25*2.75 APC both work well. I use prosynth 10% on west 50 with 12.25 and coolpower 15% on 13*4W seems to need the extra nitro on larger prop.