I bought a 2007 Diamond "The Edge" bow for my 12 year old son. Have it tuned down to 19 lbs. Want him to develop good shooting technique. Had it set up for him a bow shop. The problem I'm running into is the practice arrows that I bought for him seem to be hitting the rest. The 3 brush design of the Octane hostage rest ( XL model I think) seems to be hitting the vanes when he shoots and it curves hard. I noticed the arrows that the previous owner gave me that came with the bow seem to be slightly offset...noc isn't exactly 90 degrees to the left side vane. Am I on the right track? How do I get the noc offset like that? obviously store bought practice arrows won't work.