Something isn't right. You say it's a 2006 BowTech single cam? Are you sure it isn't a Binary cam? If it's a Binary cam (and it is truely tuned, not just set at center shot) it sounds like you're suffering from the excessive cam lean problem inherent to those cams. My suspicion however is that your bow isn't truely tuned. I'm betting that the shop just set it to center shot. If that's the case then you still have some tuning work to do.Get a copy of the Easton Tuning Guide and do some bare shaft tuning. Once you get bare shafts and fletched shafts impacting in the same point at 30+ yards, then you're tuned. You have to be the one shooting the rig to get it tuned, they can't do it for you in a shop.