hello all trying to work up some new arrows for hunting and ran into a little problem. Built up a half dozen GT 55-75 trads, 3gn weight tubes, 100gn brass inserts, 175gn points to average out at plus -minus 660gn. These shot fine out of BW 55# @ 28" recurve. So I thought I would let them fly out of my Thunderhorn coup stick 63# @ 28" and see what happens. They shot nock high and grouped left (bare shafts and I shoot left handed). Then if that wasn't bad enough the nocks started breaking off just below the head. Had 4 break this way and not robin hoods. Any help would be appreciated thanks