I don't follow what you did with the ailerons, and don't understand why they are so stiff. I've had all of the plastic planes and NEVER had the problem you are having. Maybe you should go back and look again at what YOU are doing.

Engine wise, you should have plenty of power, even on floats if you go there. The reason I mentioned a 13" prop is because we always used 12 x 6 props for the 60 engines back a few years ago. Now the 65 is a bit better then the old 60's and should be able to use a 13". You will just have to try and see what works best. ENJOY !!! RED