So I tried to edit my last post, but the editing time has lapsed.
What I wanted to say is that I have been sucessful in drawing vapor by mouth, drop the jaw and youved created a vacuum, then lung pulling then mouth drawing again, in steady consecutive cycles, on the D020d and slightly packed, it extracts pretty well, a very meditative state.
I see to get the same effect but raising my upper jaw (I guess it might be the same technique), or just opening mouth rapidly might be another way to say it. I understand the "vacuum" you're talking about.