What is the wing incidence set at??? Also, almost all aircraft have thier powerplants set at an angle to off set the affects of powerplant on the airframe. They will almost always either be angled down & right or at least to the right due to the way the props pulls thru the air. If you don't do that, you will never have a straight flying airframe. Even turbines are angled in most airframes to some degree.[8D]