I have two sv32 servos with standard arm in my -6. Dynon recommends the long arm for the elevator, but i have not needed it. The dynon ap74/d180works pretty well with elevator servo set at 100% torque and sensitivity at 7. The roll servo set at 50% torque, 2 degs/sec and sensitivity at 5. The autopilot does not hold heading well in bumpy air due to the small tail of the -6 letting the heading wander around. When the ride is smooth, it works good. The nav mode, coupled to an ifly 740, will take you directly to the airport everytime.