Always try to set up your throws mechanically first and use the Tx for fine tuning. Example, make sure all your servo horns (except throttle) are at right angles to the pushrods first so you have equal throw both ways. Then you can fine tune with your radio. You can decrease of increase throw by placing the pushrod on the inner or outer most hole on the servo horn or control surface horn. Get familiar with setting up your surfaces correctly mechanically and you will find it much easier to fine tune with the TX.