Yeah this is why it's not good to have more than one rooster together. Why stress the birds when everyone is much happier in separate quarters? Or put the extras into the freezer, then ones that are left have no one to square off with. Much happier.
Can't have more than one roo in a cage, its asking for trouble. The neurotic behavior is probably him trying to get away from the others. If you want to keep that roo get him 4-6 young hens. The younger hens are less likely to bully him.