My bf's bunny Frida is like that too, with a little tent she has (she's free range). She was a terror when she was kept in a cage (at the shelter). Some bunnies just need their own space, and will defend it, altered or not. I know altering isn't an option for you, since you breed, but the way I deal with cage aggressive bunnies that I can't just let have their own space (at the shelter there have been a few) is to go slowly, talk softly, and pet with one hand while I clean, feed, etc, with the other. Don't taunt her, and put your hand in there to pet her head when you have to go in the cage. You can gently hold her head down like some bunnies will do to show dominance over the ears, and that can keep her calm and away from your hand. If that fails, I recommend long leather gloves, or changing her cage setup.