RE: Nock Placement
Each bow and each persons releaseis different - if it bareshafts and you get great (not good) arrow flight, there is no wrong setting.
It can need change simply from varying the pressure applied to the string by your different fingers or how deep you hook.
I've had vows tune from 1/4 to 7/8 high - slightly higher for those off the shelve vs shot off a rest.
Steve