Thanks for all of your replies. I think that I may finally have things figured out on this bow. I originally took the bow back to the proshop where I bought it and told them it wasn't tuning how it did when I first bought it. They twisted one of the yokes by eyeballing it and said it was good, despite I couldn't get it to paper tune anymore. At that point they basically said the problem was me, and didn't want much more to do with me. So after a few visits to a couple of shops, the only arrow that I could get to tune perfectly was that 360 grain arrow.After some of your replies, I was hesitantto buy that arrow. So Ifinally had some good guys at Cabelas actually do something for me. They installed the bow plane laser and found my idler was leaning. So they added a few twists to one of the yokes (not sure if the same one the pro shop messed with). Shot through paper again with several different spines. Now that lighter spined 360 grain arrow was tearing, and the heavier 400 and 340 spines started shooting bullets or at least close to it. So now I'm back to several arrow options again asopposed to one. I'm also starting to think you guys are probably right about the paper tuning thing. Although better throughpaper, I started group tuning with an arrow that wasn't paper tuning perfectly. I shot it at both 20 and 30 yards at a targetmaybethe size of abaseball. I was able to stack all of my arrows inside of that target. Thatis good enough for me. Just wanted to thank you all for your feedback. Also, kudos to the guys at Cabelas for actually taking the time to help me. I can think of another pro shop that won't see my business anymore, however.