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Now the bald patch at the base of his neck is the size of a quarter. They have in there: A chew log, an empty oatmeal container, a box with a hole cut in it, a really tick cardboard box with grass and dandylions in it, and some stuffed animals. What else can I possibly add?!

For those who don't know:
I have 3 rabbits: Mocho (male), Latte (female), and Decaf (female). Latte barbers Mocho all the time, so he has bald patches EVERYWHERE. We're trying to keep her entertained.

It sounds like a ocd that has formed into a pretty strong habit. Is there a way you can split the cage or get him situated in a spare cage for a bit? Close enough they can still smell and see each other but she can't groom him. It will give him a little time to heal up and it might help break her from the habit since she will have to find another behavior to occupy herself in the meantime.