Watch your shelf/sideplate material. It will tell you the story, or at least part of it. It should not be wearing significantly except over time.
Nock high is par for the course. I wouldn't be in a hurry to move the pt down. 1/2" is real common. It is better to have your nock pt's a little too high than too perfect or too low.
I would rather have my arrow flying down range with the tail slightly up (feathers will correct this quickly) then porposing due to it bouncing off the shelf created by low nock or perfect nock but bad release.
Best of luck...by the way, we sell test kits also.
thanks, bigjim