Well I find it hard to believe that magnus would let 6 heads go out bad. I know Magnus now spin checks each head before it leaves the plant. It is possible however. I would make darn sure it's not your arrows first. Try some differnt brands of heads to see. Your proshop should be able to help you out. Use a roller or spinner, and not the "spin on the tip method" If you actually do have bad heads Magnus will replace them free.