In hands-off (and feet off) flying my plane banks to the left, regardless of wind, tank levels, altitude, etc. The ball stays centered. The ailerons appear to be in sync but we will check that in more detail. My mechanic thinks it might be the trim tab on the vertical stabilizer so we will be checking that soon. There is something else of concern to me that I think might be related to this problem. The left tip of the horizontal stabilizer is about 1.5 inches higher than the