When one considers the forces transmitted to a servo by the deflection of a control surface into the air passing over the model at speed the force transmitted to a throttle servo from the throttle spring seems miniscule in comparison. If a servo is going to suffer damage/failure due to the small amount of force from the throttle spring one has to wonder if the servo should be used at all. In all my years flying gassers I have never removed/altered the carb spring. The only concession I ever made was when there was no end point adjustment and a servo saver was used so the servo was never stalled out at the end travel of the carb.

Dennis