Do you have any links to the shallow penetration tests on the 165gr corbon load?
I found this.
.45 ACP Corbon 165 gr +P Powerball from 1911
BG: vel=1230 f/s, pen=12.1”, RD=0.70”, RW=158.8gr
4LD: vel=1267 f/s, pen=11.8”, RD=0.66”, RW=159.7gr
auto windshield: vel=1251 f/s, pen=5.5”, RD=0.73”, RW=143.5gr
About 1 foot of penetration. I know this is most likely considered in todays day and age to be "shallow."

