I too have difficulty getting rid of nock high past 10 yards.. but at 6 or 7, no problem.
I work on nock high or low in close. Without feathers and shooting 300 grains up front, I believe the arrow is tipping a bit the further out you go.
Once I have my nock height set up, I back up for the remainder of my tuning.
Generally, I already know what I need, but the test for me is having my broadheads and field points flying the same. After that, I watch the shelf and rest over time and make slight adjustments if ever needed.
Even the most consistant archer is not consistent enough to do everything the same from day to day. Wearing yourself out on tuning will just cause you to do things differently than how you would normally shoot.
BigJim