A dropaway rest should be up at full height by the time you are 1 1/2 -1 3/4 inches from full draw , no later. If your rest is coming up to full height any later than this it will drop too soon and that is when you will start getting arrows shooting lower and contact on your fletchings. The easiest way to set any drop away is to do it on a drawboard. Makes setting them up real easy.