Mine uses about:
Rudder 2" each way. ( mucho rudder keeps me out of the pits. )
Elevator 1 1/2" each way
Ailerons 1 1/2" up, 1" down. Aileron only on bottom wing, needs plenty of throw.
Both wings set at zero zero to thrust line. Err on the + side.

Since my G-38 uses a spring starter, both servos and battery packs are as far aft as possible. Actually under the Stab.

My Spektrum DX-7/AR-7000 combo has been a rock solid performer from it's first flight.

Happiness is flying a Fleet at 1/4 throttle.