Now that I see that my .3 cf/m equals 8.5 L/m and BlackCrusader's is 6.85 L/m, I can see why his causes some consternation. I don't think I've been diving with anyone who has a lower consumption than mine, and I'm a petite female. Though I have been diving with even some males who have about the same consumption.
It does sound like, though, from BlackCrusader's videos, that he breathes very shallowly. It was a little painful to listen to him suddenly and quickly take a partial breath, then exhale extra slowly but not deeply, then take a quick partial breath again. I do believe he may be retaining CO2. It might be better to breathe a bit more "normally". It's ok to have 8 or 10 or 20 L/m.