I do remember something about Dubbya having similar issues, though I don't recall precisely what those were.....I know he got it rectified, but for the life of me I can't remember what he had to do.....If it were me, I would mess with arrow spine, and if that doesn't do it......Start completely over from scratch. Make sure the bow is in spec....Tiller is right, brace height, ATA....all that good stuff. Oh, maybe also try a bigger fletching.