In another thread I found a correction for shanks and in the process also found the over the top pulls fix, which may help you. By keeping my hands as close to my body on the down swing as possible, I started hitting it flush and straight. It's hard at least for me, to have my shoulder roll with the hands in close. When I chased or actually was overswinging, I was throwing my hands out at the ball and if I did make decent contact it was a pull. Hope this helpful......