Ithink you might have a little too much downwards aileron throw when you have flap deployed. Depending on your set you can link the flap selection to a dual rate selection so that when your flaps are in the fully down position, the downwards aileron throw is reduced dramatically. By this, I mean you can assign to the dual rate selection the same switch that puts down the flaps.
The other thing to practice, at high level, is to feed in rudder input when you want to turn at low speed. Most models will respond very well to this, more effective in producing a turn than aileron alone.