A training technique you can do is while you are up in your stand, scatter several plastic gallon milk jugs partially filled with sand around your stand (between ten and thirty yards from your standor like you said 20 yards would be your max shot you would probably take this fall).

Pick a target, reach slowly for your bow, draw, aim and shoot. Hang the bow back up, take your time,and shoot another target, repeating the process to the number of jugs youhave. It will stimulate the shots youwill have totake come fall.