We have a guy at our field who flies it with a Saito 180 and a smoke pump. He is setup with stock configuration with the servos in the fuse. His flies pretty good but never saw him do any 3D, just flying around. I have two elevator servos mounted on the tail to get a 50 degree throw for better flat spins and it's still nose heavy. I measure 1/4" forward than what the manual shows at I think 4-1/2" so I'm at 4-1/4".