I am glad things are improving for you.
One thing I would recomend is that if a chicken dies, you do a necropsy yourself. It has helped me find girls that have died from internal laying as well as other things. It takes a while to get used to the idea, but I have learned a lot as well. Just my...
I did have a silkie die a few years ago from hay. I didn't know what was wrong. He kept gasping for air. After he passed away, I did a necropsy and found a big ball of hay curled up in the crop. I had been throwing cabbage and other greens down on the bedding at the time. They all ran to get the...
I would assume they may have worms and just worm them. You can get wormer at the feed store. I personally use ivermectin [which will kill only roundworms, not other worms for chickens]. I never use grit- with commercial feeds you should not need it.