So many things are happening for you, I'm sorry about the car breaking down. I hope it was able to be fixed.
If you look at some threads with biting in behavioral issues you'll see some great advice. I know we cant be loud and make it exciting for them, but ignoring it and pretending it didn't happen I feel is the wrong thing to do. They know good and well that they've bit us and that it hurts. I tell Earlybird a stern no. Or stop it which was her first word, lol. They're so smart I feel like they can learn what no means very easily. She's not done anything so far that I have to do a walk away or time out. I will turn my back to her (that is their behavior for our actions they don't like) and that will usually turn her around to wanting interaction.
I think with the fruity Zupreem, it's a decent pellet, and just my opinion if they will eat it then it's great, a huge improvement toward better health.
Hopefully the pellet and less stressful home will assist with the plucking. I think it will. I think you're also doing an outstanding job of going above and beyond to change their life and have healing for all of you. Your love and commitment are amazing.
CherylCali