I am shooting a RazorTec set at 63 lbs shooting carbon excel 400's and no matter what I do I cannot get them to paper tune. I get a hard left tear. They group well out to 60 yards but I can see may arrows spin weird. Could this be an equipment problem or or a form problem? Some say as long as they group your ok, but I don't like seeing my arrows fly erraticly. Any ideas on what I can do to fix this?