I have a os 1.08 on with a 16x8 apc. with out the SFG's on it I flyit like a true pattern ship. I throttle back on the down lines, and open it up when I'm level... full throttle passes no problem.

I used Hitec HS945MG's on ailerons, elevators and a JR8611 on the rudder. SWB servo arms, I also sealed all gaps.

With this set up I can do huge jet like loops EZ

If you are talking about the DuBro HD Glass filled plastic servo arms... this may have been the start of you problem. They do not like Ball links! Ball links will twist the servo arms, clevis's will not. The ball part is so far above or below the arm that it twist. This is why I stopped using them.

Try it... hook one up and power up the servo and test it at 1 1/8" arm, it will flex with the ball link. Then try it with a clevis.

Scott