This is the first year Ive heard of the string loop.I have been shooting a cusion under the nock and brass above for ever. I bought a new bow and it has a loop on it. Before my DL was 28 and 7 twist in the string and now it went to 27 with the loop.I tied a short loop on the string and put my release on the shortest spot and i moved the DL to 27 1/2 now. I never had any trouble with the brass and cusion and I am thinking of going back so I can go back to28DL. I reserve my string when it needs it. Its not at all hard to do.Dont worry about the serving as long as you get the bow to fit you. You will be better off. Like one of the guys said, We shoot that way for years (23) for me. I hope this has been of some help.