I used 81MG's for the rudders, but put them both on the same sides of the booms (one shows, so what?). This skips the needs for special wiring.
I put an HS125MG inside the stabilizer, and it works great. Using a 6v battery, it makes the servos faster and stronger, too.

You Turbine guys are pushing a LOT of weight around..it must glide like a typewriter, eh?

How fast is it coming in for landing? I think I would consider split flaps like the bigger one, AND spoilerons to slow her down on approach maybe? I'm waiting for Happy Jack to bring his out to the field...c'mon Jack - it's time!