I am in awe of that number. If I glance at my SAC on my Perdix, I can rarely see 8 psi/min on an AL80 for a tiny segment of a dive in relaxed conditions. But
never a whole dive.
Speaking as a retired doc as per
this post, if that was your SAC for a whole dive, and you're 70kg or more, you were right on the edge of hypercarbia, or perhaps a few mmHg CO2 into hypercarbia and were used to it.
That's been practiced for decades, but keep in mind that you may have significantly compromised your reserve if you suddenly had to exert yourself and markedly increased your CO2 production. It would be a short hop to a CO2 hit.
I'm not criticizing. You're an experienced guy. I'm more posting for those reading along. Still, cool numbers!