This is a high-wing trainer. You don't want it to be very aerobatic. Realism has nothing to do with the learning curve. With only 10 flights under your belt, you still need the gentle responses of a basic trainer. I am assuming you have an instructor helping you. I would leave the control throws alone until he tells you that you're competent enough to move up. This is no reflection on your flying ability, but you should stay with slow control responses until you are thoroughly bored with the airplane.

All that being said, now to answer your question: Moving the linkage farther out on the servo arm or closer in on the control horn will increase throw and decrease available torque. It will also maximize any slop in the control system. The ideal setup is equal arm/horn length.

Dr.1