RE: What you believe is commonly overlooked when tuning or troubleshooting.
I use a slightly different method for checking and tweaking my nocks.
For checking I nock an arrow and grab the tip of the arrow and pull it off the string (straight out the front as if being shot). If the string moves (toward direction of pull) any more than an inch or so I adjust my nock by placing a allen wrench head in the nock and slightly prying it until I get my desired fit. If the arrow pulls off without moving the string (nock too loose) I throw it away because I've tried everything to make them tighter and after a few shots their right back to being loose.