HeatherFeather, I'm glad your girl in the basement is doing a bit better!
Like you, I'm increasingly concerned about my girls -- all have the white part exposed (though no white around the edges of the comb), and I still can't quite tell if the combs are receding. It might be too soon for the mite dusting to have fully kicked in but they're still rubbing their beaks (and flicking their heads, so I'm really betting it's mites). I can't quite tell if the beak rubbing is as bad as before. The Vaseline seems to encourage it, unfortunately, since they want to try to get it off as soon as I put it on, so I'm not really sure if I should continue with that. Luckily it has not been super cold here (30s/low 40s during the day, high 20s/low 30s at night) so frostbite is less of an issue, though it continues to be quite humid what with the melting snow plus a rainstorm on Sunday. I'm not quite sure what the humidity reading actually is, but it is rather damp. Their legs do not seem to show any signs of scaly mites.
I just ordered some Avian Insect Liquidator (
http://www.vetafarm.com/products/AVIAN-INSECT-LIQUIDATOR-(A.I.L)-READY-TO-USE-500mL.html), which has a different ingredient than the dust I'm currently using. I'm hoping that since it's a liquid, it will be easier for me to apply directly to their heads. Plus I can spray the heck out of the coop with it. Has anyone had any experience with it?
I looked at Scatt as Seminolewind suggested. I know ivermectin is pretty hardcore stuff (and we would like to be able to keep eating everyone's eggs if we can), so I'm going to keep that in mind as a backup.
Ugh, this is so frustrating!
Luckily everyone's behavior, eating habits, etc. continue to be normal.