I get it Stag. I get caught up in the fine details as well. I would think the only way to get it down to the knats behind would be to use a D-loop and a release to shoot with. As long as you are shooting with fingers, 3 under/split or whatever, there is going to be inconsistancies from one shot to the next. Since everyone grabs the string in a different place because of their style of hook or the thickness of ones fingers, you have to choose somewhere to tiller from.
Maybe you can tiller some from the arrow nock and some from the finger fulcrum and see which methed produces the best and most consistant results.
I personally have always tillered to brace measurements and on occasian mapped a set of limbs, but never as Bowjunkie has described. This is the way I was told to do it when I learned a few years ago.
Trying this way of tillering on the next one.