I did balance my stabs. Not neutral but I put a stick of lead in the leading edge of each one. While not 100 percent necessary it does cut down on servo wear and if you have twins this plane can get moving pretty fast and is nice to not worry about it.
You can cut the fuselage where the wing bolts on and tighten up the wing bolts. These come loose over time. When the wing is on you cant see the holes.
I did hidden rudder linkages but... It was a pain lol.