Yeah air flow (flavour killer) is also juice flow control. Tighter draw wicks faster then wide open so closing it off a little may help you hit higher watts without dry hits. I usually only take a few puffs then switch tanks when dealing with 70+ VG. Have a rotation going. vaping the same flavour can make it taste muted, I usually switch flavour every time I change a wick/coil in each tank so usually one flavour is fresh till another tanks needs rewicking/replacing.