I helped a buddy paper tune his bow and came up w/ the same problem. and after starting from zero twice and laser tuning it. I shot it my self. It was fine. Come to find out when I watched him shoot . He had a tight grip on the bow and was torqing it. it only takes a little extra grip to throw the bow off. I'd make sure if ya have a sling you got a loose grip of the bow. My self I dont grip it at all. and let it fall forward adter the shot. just some isight. dont know if this is a problem for ya.
good luck.