I'm so sorry this happened to you.
When my chicks were about 2 weeks old, they all ganged up on the smallest, a RSL named Penny. When I found her, her entire bum feathers were pecked out and she was bleesding. I cleaned her up and seperated her. Well, later that night, she got back with them and they haven't bugged her since. I didn't use bluekote. I used Rooster Booster on her bum. A few tried to peck her again, and it was gratifying to see them freak out because of the taste. lol Now they are picking on a MUCH bigger chick. A 6 week old EE named Holly. Mostly its my BR, Yoshi. She's decided that she is the cool chick and Holly is the nerd.. or something.
Anyway, I totally understand what you are going though. Get some bluekote or I'd recomend ROOSTER BOOSTER. Good luck with them!