I would recommend trying to adjust the nocking point. You can always move it back. If your broadheads are off by 3 or 4" while calm, they may be off significantly more in windy conditions. I don't think you should shoot a broadhead that is planning (if it is). Also, what goldtips are you shooting? 5575 would probably be a bit too weak for your setup. I would also recommend comparing the groups at various distances. This will tell you if some planing is occurring.