i think you are making it too difficult. just make sure that when your arrow is on your undrawn bow that there is a slight downward angle, and i mean slight, when your rest is in the up position, ie: the nock of your arrow is higher than its tip, barely, when your rest is in the up position. start there with paper tuning, checking for fletching contact, etc. - then shoot some groups. then move your nocking point up a little and shoot some more groups and see which is better.
depending what rest you have you may have to play with it also to get it grouping the best. just do 1 thing at a time.