Hey, goirish, do me a favor and check something while you're messing with your ailerons.

Hold the torque rod fixed with one hand and try to move that aileron up and down. If it moves at all, there is a simple fix. And more to the point, that sometimes causes the ailerons to be out of square (the 90degree angle deal) and show more throw one way or the other. Needless to say, check both ailerons.

You know, this needs a picture or two.