Get the nose up higher. You have to get it up into a stalled attitude. If the angle of attack is too low and the wing is still flying the ailerons are too effective and the roll rate is going to be faster. You want to get to the point where pretty much the only thing effecting the ailerons is the prop wash. You MIGHT have too much aileron throw, but usually the problem is trying to do it with the nose too low.

Some people do start out with low rate ailerons and doing more of a rolling circle than a rolling harrier circle to get the feel for using rudder, elevator and ailerons. As you progress and get to where you have better control just start pulling the nose up and flying forward more slowly. As you do you will see that the ailerons will become less effective and you will NEED more aileron throw to take full advantage of the prop wash to keep the plane rolling. At least that has been my experience.