Thanks guys. Would going to a hole closer to the control surface on the aileron control horn and a shorter servo arm help?

The Stearman is set-up using the outermost hole in both servo arm and control horn. The servos by the way are standard Futaba S3004's with 42 oz torque. The manual specifies a minimum of 54 oz. Guess I'm flirting with disaster! If I go to a 6 volt battery, that will boost the torque to 57 oz. I think this may be a wake-up call! Now the decision, bigger battery or bigger servos!

John