Why not try sights. Don't let the neo-traditionalists discourage you. You might be amazed at the accuracy you will pick up and it will telegraph to you immediately all your form errors. No longer will you be able to blame your misses on a poor aiming point. Try taping a rubber eraser to the back of your bow (the side away from you) and stick a bead headed pin in it. Won't cost you anything and you might surprise yourself. It will definitely improve your non-sighted form when you see how that pin jumps around.