qweedqwag,
The download manual suggest only 30 degree's max (high rate) on the ailerons and 18 degree's (low rate). It also says that with the 30 degree setting on the ailerons, 40 degree on the elevators and 45 degree on the rudder, if the controls are pulled hard at moderate high speed, it will cause the plane to stall, tumble and hunt for dirt. Try these settings and it will be easier to fly and you might get rid of the buzz coming from the servo's.
mstcitabria