Setting a SLIGHT amount of down trim (flaps) to both ailerons might not be a bad idea, especially if they are slightly up (spoilers) right now. But adjust the linkage so they are no more than 1/8" below the T.E. of the wing, probably 1/16" would be better. Loose linkage or sloppy hinges could be allowing the ailerons to fly in a slightly upward condition under normal flight.