ever tried a brass nock set? they pinch down on the string as tight as you want them, and as long as you are not using a facemask, you can still feel it in the corner of your mouth. My friend shoots this way, because he too had a kisser break.....Just pinched on a brass nocking point and he was good to go.....He likes it.

I dont like them though, and dont use them.I guess my advice is 2nd hand, so take it as such.