When you look at the war birds the ailerons are small in comparison to say an Edge or Extra 300 and they are out on the end of the wing. Air travels laterally across the wing towards the tip and that is where the greatest force is. wing shape dictates the amount of aileron needed to fly right, having a large one on some planes cause more control problems than others, the throws can be to much or to little. Look at a plane design like yours and follow suit, you should be ok.
Leroy