i had the same problem with a super stick and had to move the engine out quite a ways,it looks kinda weird but solved the problem.if i hadn't have moved it it would have taken over 10 oz of weight to balance.i sat the engine on the mounting rails and adjusted it back and forth until it balanced,you can try heavy'er wheels and prop washer if you don't want to go the way of moving the engine.I'm not big on adding weight to a model if i can avoid it.