Well I think I found out what my problem is. I double checked the CG and it was off by1-1/8" too far back. I guess I mismeasured. I had put a 5 cell pack in it and I guess I installed it too far back to balance a mvvs .49 as the engine is already as far forward as it can go. I think I'm going to buy a saito 82 instead of adding lead to the front.