I know the cams are on and bare shafted to bullet, fletched shaft rode straight through as well but when I tune for groups at 40 I wind up with just a little left-high tear through the paper...could this be a symptom of overspine?
It's not uncommon for a well tuned bow to keyhole an arrow a little bit thru paper. Some guys paper tune specifically for a bit of high left tear because they've found that when they're done with fine tuning, that's the exact tear they get.