In the controller setup click the advanced tab. For starters set default scaling for pitch and rudder, no scaling on roll. Use no damping, it makes the control mushy, use the minimum deadband that keeps the autopilot on.
If you are trimmed for your speed you may be crossing the center point of the stick when adjusting your fire, if you have dead band it will interfere with smoothness. Try trimming nose down so you can adjust the nose position without crossing a dead spot.