Are you holding the bow with a locked or slightly bent arm? Or is this just due to bulky clothing? More of a concern, to me, anyway, is that you are shooting 28 inches instead of 29. Bad habits are made that way, and could actually be part of the problem. A bow that is set to fit you correctly could make all the difference in the world. Now if it is a bulky clothing problem, a compression sleeve could be the ticket.