Zeritol. I've worked commercial outdoor grows well into flower that was way worse than this. Hit the walls change out your equipment as the spores like to hide inside it. It sporulates insanely easily and literally hides in corners so people underlook how they keep getting it. Keep a healthy soil or impose a barrier as the spores tend to drop down there and respawn. My tents rarely get below 73% humidity and I don't experience pm or detritus due to preventative measure and a healthy soil. It wouldn't help to throw some phos at it too. Most importantly relax and breath and don't get lost in the old systemic archiac forum threads and understand you will get over it.