You're right, the buzzing means the servos are stalled at full travel and will use up battery power at a prodigious rate.

I don't know what "weakest torque possible" means, but it doesn't sound good. Please describe your setup. How many holes out from the center of the servo arm do you have the pushrod? How many holes out on the control horn? What is your aileron EPA set at? High rates/low rates? Differential? How much travel do the instructions call for and how much are you getting before it binds?

Jim