The 3305's are very inacurate servos. They are fine for most types of flying, and there is no danger using them. I do a lot of precision and heavy 3D flying so I wanted a little more from my servos. I would recommend The hobbico CS-160, tower stock number HCAM0312. They are good servos, I am using 4 in my 1/3 scale, and the hitec counterpart (hs-5645) in my cap 1.60.

Did you mean a 20x8 for your fuji?