[66stang]

First off remove the big fuel tank. Then balance the plane on the wingtube for starters. then lateral balance the plane. After all that do some up lines and down lines to check motor thrust angles. But don't do anything until you have the plane balanced. After that use a 22B or 23A vess prop. Make sure you have enough rate for 3D in your controlls. Also make sure none of your mixes are causing problems. Way to many people put mixes in for things only to find they screw something else up. If you have them on a switch turn them off and try with out them.