AFAIK, The mid-bead setup is to assure the shooter of proper form... Mid-bead in alignment with muzzle bead to assure you are not cocked off or canted over (both official terms in redneck engineering manuals)...
As for "sight picture" my "close in" shots put target's head in the top position of the "figure eight" with "CoM" being POI. Further out requires personal changes to POA/POI...
Brent
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