I'm sure you'll get better answers from others that would know more than I would, but I just recently went to a string loop and did it all my self. From all the reading I did and question asking, it seems that a good place to start is about 1/8" above center. (By above center, they mean the center of the hole that your arrow rest screws into.) This is where the nock should be placed. So, to look at it, the nock would look almost level. Paper tuning it also, I think would have been an appropriate thing for a Pro shop to do. This would help to "FINE TUNE" your nocking point.

Do I have this pretty close guys??