That may of course not be an issue at all, even preferred, but I wanted biggest airflow for DTL's, and I found the same thing on a Dani Fusion 2 - when the screen was pushed right down to the bottom of the bowl, it significantly reduced the airflow, and I had to push it back up by 1mm or less (prob 0.5mm, but couldn't measure accurately at the time), and this opened it up back to how the half bowl setting had been, huge improvement. Of course the base of the bowl could be shaped (maybe grooved radially) so that wouldn't happen, or be much less an effect, but I can't say without looking beneath the screen.
I'd drink some ethanol instead next time before trying this! ISO makes my eyes go all wobbly!