Hi guys. I just got my Vamo V3 and Kanger Protank in the mail the other day, and if I screw the Protank on all the way then it becomes virtually air-tight and won't pull/drag at all. If I unscrew it a bit, it gradually allows me to puff on the device (more and more as I unscrew further). What gives, and how can I fix this??? (I think it is just a Protank1, because that's all it says on it and on my receipt.)