Thanks everyone for the advice, I’ll definitely get some permethrin if the lice doesn’t clear up soon.
As for how they are doing now, almost all the lice is gone! Before I made this post, I bought a 20lb bag of DE, and I threw a cup in the coop just to see what would happen. Well, I just took everyone out last night to clean the whole coop (this was the soonest I had the time), and almost all of the lice were dead! I counted maybe 3 on my Cornish cross rooster, but other then that, my 4 layers had none! When I made the post, you couldn’t even see their skin it was so bad, and if I went near them, I was covered. I also checked my 2 bantams inside, and they were clean too! I still cleaned the entire coop and sprayed everyone with the garlic/cinnamon spray just in case and to get rid of the last few I saw. I know there are still eggs on them, so I’ll be spraying them every other day for 1-2 weeks just to make sure, but if that doesn’t work (it should, it worked wonders last time) I’ll go get some permethrin. Thanks again for everyone’s advice!