I have an OS 70 SurpassIII with a 14x4W on mine and it is just right with 15% fuel. I use 30% so I can have "afterburner" if I need it.

I still need to put some more right thrust in. Either that or I'm way out of balance laterally. What do you think guys: When I pull hard for a wall or something like that, it's straight up perfect. However, when I start to hover it yaws HORRIBLY to the left, I have to keep like 75% right rudder in it to keep the nose pointed heavenward. No bad tendencies on takeoff, roughly laterally balanced before first flight and havent moved anything. Even if it is off a little on the lateral I don't think it would be this bad. Rudder and fuse are straight as an arrow. CG @ 6 1/2".