Its not so much the moving power of the servo, but the holding power from the servo, or the ability of the servo to hold the surface in the position required which is more that the amount required to move the surface.
I have done AMP draw tests with servos and there was more current draw to hold the servo in a position than to move it to the position in the first place. Yes it was loaded up with tension in the first place before any movement.

Cheers