I am shooting my broadheads lately and noticed that by rotating my nocks 120 degress my arrow will impact different. If I have it in one position it will hit right on or within 1 inch of my fieldpoints. then I will rotate the nock and it will be a couple of inches off. Does this have to do with spine? What exactly is spine on a arrow? Does anybody else have this problem when shootin broadheads? I am shooting the maxima 350 at 70lbs out of my outback. I have managed 8 real good flyers out of a dozen. I also heard that easton acc arrows have the most consistant spine out there. Any thoughts? My montecs are shooting real good out of the 8 good arrows, but was just curious why nock position would make a difference?