Have you tried moving your rest to the left? This is a strange phenomenon I have had in the past. I've always heard to go the opposite of your broadheads to get them in tune, but I've find at least on the centershot, that I have to follow my broadheads with my rest. I don't know why, but it's been that way since day one for me. That was anything I have shot.. Martin, Ross, Elite, PSE... I don't know, it's a very strange deal.