RE: String loop: nock or no nock?
When I shot a release and loop (yes BPS, I've been there, done that and got the T-shirt), mine was setup with a nockset about 1/8" wide between the arrow's nock and the bottom loop.
When I drew back with just the loop, my release was pulling the loop upwards and the jaws of the release were not directly behind my arrow.
By putting the nockset between the nock and the bottom loop, it lowered the center of pressure on the loop, putting my release directly behind the nock. Maybe it's no biggie, but I felt more confident when I knew my release was directly inline with my arrow. It SEEMED to make tuning easier.
Also, the bottom knot on the loop never gets as tight as the top one. I've had the bottom knot slide up the serving and start pinching the arrow's nock. The tied on nockset eliminated that problem.