Richard L. well the problem must be my flying, my CG is also 107mm or 4and 3/16inch from the leading edge the same as yours. I noticed in your picture that the plastic is cracked near the wing fuse seal, mine is cracked there also and the pilot is starting to come loose from the cockpit. The funny thing about my landing problem is that it takes me more Runway to land this plane that it does for the real aircraft that land here, i fly at a city airport and it just doesn't seem wide enough for me when there is a cross wind.