Hello, and Welcome to Cat Talk!! Your kitties are adorable! I'm Mary, Mom of Boogie, my sweet little Domestic Short-Haired Tuxedo. I really don't know about the biting problem (I've never been through anything like that with Boogie) except that it is probably just a phase. I'm sure most kittens (or even some cats) do that when they are young and un-trained. Manx's have the (quite amazing) ability to jump and balance without a tail. I've always liked Manx's, especially because most (I'm not sure if all) are black and white. I hope to see a picture of kitty # 4 soon!!
Good luck with him!
-Mary
Website: http://www.angelfire.com/al3/coolcatband/index.html