I'd question keeping that one that bites you while you're holding him. That's a little over and above, but maybe he'll grow out of that. That's like famous last words for young roosters...maybe they'll grow out of it.
I don't see ours picking on the hens, but the newer roosters may appear to be doing that as they don't know what they're doing yet. I've seen one mate an old hen 4 times in a row, one of the times he was backwards, until I ran over and shoo'd him off her. We can't always see what they're doing but hopefully they just get past that.
Usually, it's about a year or more before any quirks get outgrown. Some may never stop being mean, and that's when a decision has to be made.
Roos will protect the ones that are hanging out with him. Other chickens will hear the call for danger too.