My understanding of the way the airflow is setup is that the adjustable airflow only controls air coming from the side port not through the base but I may not understand how the air routes. But tight on the screw does not shut it off on mine just tightened it up some. It's still twice as loose though as my iclear 30.
Yeah, I think it does still provide some airflow even when you close it down completely. I usually close it all the way, then give it one turn open. It's still a fairly loose draw, much moreso than the T3S tanks, but I'm getting used to it, and really love it after a bit over a week using it. More, please!
I'm also playing around these days with a Caterpillar RDA, and THAT takes some getting used to. The throat hit just about kills me, unless the e-juice has absolutely ZERO throat hit. I keep that airflow closed except for one hole, and it's still a lot airier than I'm used to, but if I close it completely, the heat REALLY kills me. Mainly I guess I'll be using it to taste new stuff; it's got a single 2.2 ohm coil in it, which was quite nice when I tried some of the French Vanilla I've had steeping for a few weeks, but the Belgian Cocoa apparently has some TH of its own, because I nearly choked when I took the first hit. Turned it down to 6.5w; I can definitely taste the Belgian more in the dripper than in any of the tanks I've tried with it, but it's still just... underwhelming.

Andria