SlimmKeep humidity low, keep the air moving, never spray your flowers and inoculate with Si during veg.
I agree with you about the humidity and air movement completely.
And while I disagree with you 'slightly' about spraying flowers, you should certainly apply Si to the roots during the entire run of the grow - especially in the flower cycle where the density of the flowers and massive resin levels (hopefully) the need to give the plant every possible defense against PM is at its most important & crucial time.
At least where I live which is a test laboratory for every strain of anaerobic fungi you could ever find. Fighting PM in Western Oregon is a multi-million dollar a year industry between produce growers, orchardists, vineyards, grass seed growers, forests, ocean air, etc. You couldn't find a better environment to bring PM into your grow.
YMMV
CC