That sight should only have a 1 5/8" sight ring? It sounds like you have something out of spec. Centershot should be very close to 11/16". Check for "Idler Lean" at full draw. It should be straight at full draw. Maybe you're torqueing the bow? If idler is straight at full draw then draw back your bow with an arrow nocked and your eyes closed, once you're anchored in look at how your string is tracking at your idler wheel? If you have no idler lean and your string isn't tracking straight you are torqueing the bow which could cause your problem. Even a warped limb could cause that, but I seriously don't think that's your problem. I would say it's (1) centershot, (2) idler lean, (3) torqueing the bow. Merry Christmas