I like a restricted lung hit sometimes, too. Well, I guess I like to have options, depending on my mood. I have some Atlantis and Triton coils in my stockpile, and I was thinking the tighter airflow through the BB could make for a nice vape with them, but I'm a little on the fence about it. I was hoping for some anecdotal evidence to persuade me one way or another. If I can't get a rev 4 it'll be a moot point though, so maybe I'll wait until I have one in my hands to decide.
Little if any difference in airflow, but both can be tightened up with a mere finger (over holes). It's a wonderful little feature.