Smokin, if you are good with your fletched arrow flight, cool,or try that 5/8" with the arrow reversed ( cock in) and see what that does. My RER prefers cock in.
Michael, as stated above, have someone else review and watch your form to see if it is a form / release issue and not an equipment issue. In lieu of that, make some video of yourself in action. Close up, not so close up. Look at release of arrow and at your arrow hand form ( elbow up ? Fingers in line and not pulling more with one finger).
ChuckC