CG: 1.75-2" behind main spar, low rates: <30 degrees all surfaces, high rates: >45 degrees all surfaces. These specs are from the FF540P instruction manual. You probably should add a little expo also. I use 30% on low rates and 60% on high rates on elevator and ailerons, 25% on low and high rate rudder. Flaperons and spoilerons both at 100%. Mine is set up with an OS 70FS/APC 14X4W prop, HS-81 on throttle, JR DS811's on the flight surfaces, 1000ma 6V NIMH, R700 Rx. Still waiting on the good weather. Enjoy.