First thing I would do is check for fletching contact,brace height, A/A and cam timing. If these are on specs next I would look at the string,arrow and sight relationship (arrow rest in full draw position) If they are not ligned up, adjust them until they are. then do your paper tuning and walk back tuning to fine tune your center shot When all of those things are in a direct line the string should be in the center of the grip which is in MY OPINION is where center shot is.

GGBH