Go to the pattern board....put in a full choke / and shoot at a 3" dot at 21 yds or so .....and adjust the comb until the gun is hitting that dot !
Lock the comb in place...and forget it !
After you've done the Point of Impact test ---- then check your pattern / with an XS Skeet, I'd probably set it for a 60% / 40% over point of impact.
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Then just go shoot it ...( like you did before )....well hopefully with better scores ( cause Geez....your scores were starting to smell a little buddy ) ....