I agree the servos need to go no matter. Another strange thing mine did: Full throw elev loops would make it snap/high speed stall. Loops with 75% of the max throw, would make the loop the shape of a stop sign. It's like it was stalling and catching all the way around the loop, if that makes sense. BTW my elev halves were joined in the center, so it was not a weak/strong servo issue. Lateral balance did help some, but not cure the problem.
I'll be watching with great interest to see how it handle the upgraded servos.

david