HI ZAQURON! I hate to ask the obvious, but are you trimmed for hands off in level flight? Does your plane stay hands off when inverted? The bias of the ailerons can cancel out this trouble [as was stated before]. The majority of the drag is on the cockpit side, so all things being equal, I would expect a tendency to pull that way? You are flying a proven design, so it must be more to do with your set up, than it is the design of the plane.