My post-update SwiftPro is air tight, can't blow in the mouthpiece with the bottom hole blocked. So hopefully you should get a solution soon.
For the battery capacity it's clear it's on the low side (1000mAh @ 2S, which more or less translates to 2000mAh @ 1S for comparison sake) We use 2500 to 3000mAh cells in the Milaana (@ 1S). With my usage pattern I get only 3 bowls per charge. So I expect the CFX/SwiftPro to be 2 to 2.5 bowls per charge, which seems to match what I experienced during my initial tests.
On the other hand it charges lightning fast, and in about 15 min you can get enough juice back in to vape some more. I wouldn't recommend using the pass-through charging capacity as even if it sounds tempting, we know it's bad for the cells, and the cells will be the Achile's heel of this vape. So in order to preserve their longevity I would avoid doing that.
So far with my limited experience I got best results by tamping gently my load, then doing very strong and long direct to lung inhalations. Everytime I got a small hit, I have to remember to draw harder. And when I do I get a large cloud afterwards. The vape creates the draw restriction itself, you just have to draw as hard and as long as possible an it keeps up.
To test how it handles, you can try blowing as hard as you can in the mouthpiece and put your finger next to the bottom air intake (beware not to burn yourself and don't do it for too long, this path is not supposed to be reversed and we don't know whether it could damage it) But when I did that I wasn't able to overwhelm the heater. I'm not known for having iron lungs though, so I'm curious about what you will find.