I am using the Excel string. My Brace height hasn't changed since i've shot it a few times and twisted the string to set it just over an inch from the front. I using the rope cocking device and I have the string marked with whiteout so i know its cocked the same everytime.. I used lock tight on the mount and did put a little on the Bigger ring screws but i think i might have to do it again because i could tighten them yesterday.. I'm afraid of stripping them. I had a pair from Dunhams that stripped real easily when i tightened them.