Feather mites or something worse?

[Tab P]

I haven't been able to determine if the treatment has been effective yet or not. I've only once done the treatment with Elector. My property is so large that I used 3/4 of the $200 bottle for a single treatment.

I tried permetherin dusting in the beginning and dusted weekly for a month without improvement. Then I went to Ivermectin pour on and treated with that about 5 times. (I wasn't good about treating every 10 days exactly so I extended the treatments until I was able to do it every 10 days for 3 consecutive treatments). The Ivermectin seemed to work for a couple months but then it started back again. I treated the once with Elector about 3-4 weeks ago and I'm still waiting to see if there is obvious improvement.

Did you get a resolution for this issue?