Treated entire flock and total clean out and spray down of coop with Permethrin 10 that I mixed using the 1:19 ratio (6.4oz per gallon) a week ago. I had a few that looked pretty rough but not horrible then tonight a week later when treating again they look worse! This was the first time I really saw the eggs and a couple looked like the one I have in the photo. I repeated the same strength treatment tonight. Should I switch to pour on ivermectin or any other suggestions or just keep repeating weekly? I put out a new dust bath with ashes and DE too.