Since you' re an experience shooter, I doubt you' re getting your hand too far around the grip. Your draw length isn' t likely to be too long. An overextended bow arm might be the culprit but I suspect either brace height or arrows that are too light.

Put about 5-6 twists in the string to raise the brace height and see if it helps. If it helps, but still makes contact, put another 5-6 twists in the string to raise it some more.

If you' re shooting light carbons, you might try adding some weight by stuffing a few strands of weedeater line in a couple and see what that does for you.

Also, make sure your arrow nocks aren' t too tight on the string. They should be just snug enough to hold the arrow on the string with the arrow pointed at the ground, but loose enough that they' ll fall off when you thump the string.