Hiya, and glad you popped in!!Everything is going well. My girls have been struggling with some skin issues and retaining feathers. I've been treating them with mite spray so hopefully that will help. I've been very busy and recently found out I am pregnant so my husband has been doing a lot of the chicken chores in my place!

Most here would recommend permethrin spray or powder. That may be what you're using already though. It should be repeated in 10 days to kill any eggs that hatched.
You can up their protein a bit which can help with feather growth or regrowth. You can try blend in some All Flock or chick starter/grower to your layer feed of which both are usually higher protein. You'd have to set out some oyster shell though as neither usually has enough in it for laying hens.
Congrats on the pregnancy!