Cant shake this stubborn pm

Hey all. Its been about 5 weeks since powder mildew made it into my flower room from some new babies I brought into my garden. Since then i have not been able to get rid of it. ive tried green cure, zero tolerance, high temps, low rh (between 35 and 48% is as low as i can get it). Neem seems to work (mixed with pro tekt) but can only spray this while vegging, I beleive it will keep the pm off longer than green cure. Every day i walk in the room there is more pm. i spray with a light mix of green cure (buds also, 7 wks!). i just dont want this stuff to take over my dank herb, so instead of lose it i spray it . how do i get rid of this? i understand that it is inside my plant and ive heard that its like std's for plants (unshakable). what else can i try in my flower room? i dont want to spray every day as i fear that it will ruin taste and its perpetual so i would hate to shut down 4 trays for a while... my veg has it also but can keep it in check with neem... its indoor (my house) so im pretty sure i CANT burn sulfur in there..right? i have a 50 pint dehumidifier already too. theres 4 1000w's and 4 rezes (covered) so humidity is a prob without the dehu (sealed room w/ co2). help a brother out! what worked for you? thanks everyone and good growin

I know I just posted but one more thing. pm is pretty bad today (25% of leaves have it, some are blanketed with it). I really dont want it going all night without being sprayed but fear that spraying it will increase rh for tonite as its dark for them soon so i am gonna let it go ive been spraying it with green cure but it comes back very fast now, almost like its getting imune to it. does this sound possible? will i have to shut down and get new moms to get rid of pm? (moms have also had pm issues). also, if it gets out of hand what would be the next step? thanks all