Originally posted by RJConnet
Is your servo actually moving as you force the elevator or is the CF pushrod bowing. I know the CF is very stiff but that is a fairly long pushrod if they are unsupported. Are you having the same problem with your aileron servos? If not, I would guess you are having pushrod troubles as the 625's have the same torque rating as the 605's. 
Yes, Servo is moving. Pushrod is made of 1/4 CF tube. It doesn't bend a bit. The problem is, that Hi rate is 6 times more than low rate. Maybe it is a junkie servo (both behave like that, and they are brand new - I have bought them yesterday).
See the following video clip, I have just made. First part is hi rate end-to-end movement, next is end-to-end low rate, and then how the servo gives up under the force. You can hear the servo humming.
http://rysium.home.comcast.net/servo.wmv
I'm going to LHS tomorrow to check them and probably replace for digital. I think two HS-5625MG will do the job (131 oz torque each).
I don't see a problem with ailerons just because on hi rate they move just 1 inch, and 0.5 inch on low rates. So first of all the wind force is not as strong as on elevator, and if they give up, it might be less then 1/8 inch (which is 1/4 of full deflection on low rates).
I have been warned, that ailerons might give me a problem on the "wall" or "parachute", and I might be forced to put digitals there too.
RysiuM