No pictures right now, but I figured I should report: After cleaning up the barrel and slide lugs and installing an 18.5# recoil spring, the group is down to about 8" high. Still more than I would like. 3-4" would be ideal. I would guess that most of that drop came from the heavier recoil spring.
Recoil itself is still heavy and sharp, though slightly reduced. (18.5 spring) Right after shooting the BHP, I shot my .45 1911... If I am honest, they were about the same. Slight edge to the .45, but that should be expected - it is a .45. This is with heavier recoil springs in both guns. The BHP is up to 18.5, and the 1911 is up to an 18.
After firing I disassemble it and inspected the lugs. No further wear was noted. Of course, it was only 24 rounds, but it is worth noting.