Two Servos on a GP Spacewalker Elevator ??
I've got 2 servos for the elevators, and it was very simple, and reliable. But neccesary? no, not really. But hurt it? Not even.
Oh, and 2 1/2 lbs of lead? Something VERY wrong with that plane! Saito 91 pulls mine great, and 5 cell batterry under the tank mine is just perfect balance w/o added weight!
JMO