Maybe it's just me and I'm missing something but unless both ailerons are moving up and/or down at the same time, you shouldn't have any nose up pitch issue. If you move the stick left, the left aileron should go up and the right should go down and you turn left. Generally the plane will pitch down some. The reverse is true if you move the stick right.

So, what's going on to cause you to think that the ailerons are giving you pitch problems?