I took the time to get a screen wedged into the smallest stem I had. I haven't bothered pulling it out when cleaning it (drop the whole thing in an ISO bath), since it was a pain in the ass to get in there firmly. (I'm not the most tactile or experienced person though, so YMMV.)
For a brief while, I flipped over to the longer stem since I liked the cooler draw. It got dirty pretty quickly, as I used it without a screen, so I ended up switching back to the small bowl plastic tip stem.
I personally prefer the screen being wedged in between the glass draw holes. Tried the screen sandwich today, and daaaaamn. If you want smooth without trying the hamster invert trick, that's the ticket!
dunno what y'all use for cutting screens, but the wire snips I took to a screen just made the edges where I cut really sharp... so I don't bother cutting. I shape it and stuff it in there. Only done this a couple times... didn't buy many screens since they were pretty overpriced at the place I got my Air from, but y'know -- convenience!
mostly seems to me to be affected by how I pack it... If you pack it firmly, the draw resistance is greater?
that's why I tried the screen sandwich today, actually! One screen helped with consistency in packing for air flow (not stuffing up the draw holes), the second screen prevents the herb from falling into the heating chamber and directly touching the element. That's when things get toasty, and I don't like the taste / harshness when things are crispy, as I don't use the Air with water tools. That will change when my shipment eventually arrives