I did mine with agricultural vinegar 1 part to 1 part water, added peppermint oil and a cup of dawn soap all in all 2 gallons. Damn near choked myself out. Sprayed everything. Sprayed some our property with seven... it seemed to help. I could tell by the dogs. Crazy thing was after I sprayed and it dried I let the birds out. Some of my older girls hadn't gone in the backyard since all this started, its like they know. They immediately were in the yard and not itching. So its anecdotal, but Seven seemed to help. We have 3 acres and I only sprayed about 1 in total. Just trying to keep them off the dogs. I may try Seven in the coop and enclosure too.Well, I’ve dusted all the chickens 7 days apart now, and yesterday I completely stripped the coop and SOAKED it in Sevin spray, let it dry, and then let the chickens back in for the night after dusting all the roosts, nest boxes, floor (any flat surface) with permethrin mite dust. Today I will clean again, dust again, and put down vinyl flooring to make cleaning easier. I got one single mite on me(that I was aware of) in all the cleaning, so the coop itself was definitely not crawling with them. Now I’m wondering (worrying) if Sevin is actually effective against the NFM! Sure hope so.
I notice a number of my birds have bald patches on stern or back, but they didn’t look particularly inflamed when I was dusting them, so maybe it’s just seasonal molting? Lots of loose feathers, too.
My girls look very similar to what you describe. I have fricking 4 broodies right now too. Nightmare. Headed to the doctor tomorrow to see if they can help me.