Welcome to the forum! As you may have noticed, it has become rather quiet lately. That being said, it is still my first go-to for questions. I'm guessing with 11 Cresteds, you have far more experience than me and there are members in the forum with far more experience than me.
I got my first hairless Crested 9 years ago and fell in love with the breed. They are like Lays potato chips -- you can't have just one! I currently have 2 hairless and a puff -- all adopted from rescues. Not knowing exactly what the problem is, all I can say is I feed my gang a limited ingredient diet of venison and homemade dehydrated snacks. My hairless get brown sugar scrubs during baths. This can be a mistake when tossing more than one in the tub at once, as they frantically lick the scrub off each other. LOL! I'm not sure how you handle 11 at once? God bless you. I can't even begin to imagine the hyperness going on in your house?!
I will say, my newest addition had a horrible staph infection when I adopted him. It took about 6 months to get it under control. Then he had a much needed dental and had 11 teeth removed. Bailey is my work in progress.
Please do expand on your problem with Eddie and we would love to see pictures.