I would get a No-peep and some kind of arm guard to put over your hunting jacket to keep your sleeve out of the way of your string. The No-Peep is great since it shows you if you are torquing your bow. You would be suprised how much you could be torquing your bow when you have all your heavy hunting clothes on. This has happened to me in the past and these two products made all the difference. I would put money on it that your bow was torqued when you shot at those deer. Any torque can throw you shot off by feet not inches especially on short axle to axle bows.