Maybe I am missing something here but when I am seeing lots of rib before the bead, it's too high at the comb
Try a slip on recoil pad. That will drop your cheek lower at the comb
But, he doesn't need it to shoot lower, he needs it to shoot higher.
If it shoots 12" low when aimed it's a gun problem. When a shotgun is mounted properly, and you can't see any of the top of the rib, only the bead, it should shoot flat, 50/50. If it has two beads and you stack them, it should shoot about 60/40, possibly 70/30. It should NEVER center the pattern 12" below the POA.
As another poster said, the barrels could be bent to fix this, but that's a lot. I'd let it ride on down the road, if it was mine.
SRH
