When I put a peep in I get it close by measuringthen I pull the bow back with my eyes closed and anchor where I normally do. When I open my eyes my peep should be in the right spot. If not I move it slightly to where it needs to be. As many years as I have shot I have a measurement I go by so I am usually really close
It can vary slightly due to A to A and resultingstring angle changes.
Dan