FYI - I found a fantastic product to finally kill the mites that I've been battling for months. I even wrote a review, here:
https://www.backyardchickens.com/products/elector-psp-premise-spray-8-oz/reviews/9496
I don't think many people know about it because the retailers are all advertising it with the old label, as a premise spray only.
I thought I would tell you all about it, in case any of you are having trouble with other products not working, like I was.
I remember reading about this product looking through some Elanco literature. Spinosad is the same ingredient for Comfortis, an oral dog tablet which repels fleas and ticks. People prefer it when dogs have allergic reactions to topical flea treatments. It is used for cats too.
Elector would be a good change up to permethrin or rabon. I have seen consistency with Ravap EC or Rabon 50 WP as a change up to Atroban, Permectrin II.