Powdery mildew is ridiculously easy to beat. Sometimes I forget not everyone has heard of Korean Natural Farming.
Just stop fucking around with everything else and do two things:
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Look around outside your air intake. You obviously have recurring source of inoculation–check bushes, weeds, even the neighbour’s rose bushes. The spores are entering your grow repeatedly. But then again, PM is in the air pretty much everywhere, so:
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Make LABS – Lactic Acid Bacteria Serum
Here are some sources. This shit is so cheap and easy to make (milk, rice, cane sugar). Literally one application and it’s gone forever. Like seriously–stop fucking around and make this recipe. Follow the steps. Use it as directed. Watch the weeks roll by. Thank Dr. Cho Han Kyu and then come here and thank Dr. Zinko.
https://blog.bolandbol.com/2017/04/24/more-knf-introducing-the-fabulous-lab-lactic-aid-bacteria/