I agree 60 oz. is not enough. There is a lot of force when you are using full 3D throw and engine running wide open. I say .90oz or above. Be on the safe side.

As a matter of fact right now I have a elevator servo that is failing on me power wise and it is rated at .94oz. I first noticed when I was on ground and ran engine to full throttle and pull full elevator. I seen that my right elevator half was laying down. I would back off throttle and it would raise up to normal position. I dont think it should of done this, so guessing I just got a hold of a bad servo because it is not all that old.

Not that I fly full speed and yank it around. But doing 3D flying slow there is still a lot of strain on the servos depending on what you are doing. Especially those short burst of full throttle can be hard on them.