How about a Queensland grouper for a bigass fish? Or stellatus puffers, maybe some Titan triggers. I know they nip the eyes out of more "home aquarium-suited" sharks, but I have no idea about the big guys you're planning. They might terrorize the wobbies though (if they don't get eaten for trying). Like I've said before I'm not too well-versed in home-aquaria, but I know that all hammerheads school in HUGE schools so you might want to drop the Great hammerheads. They also migrate (it's still kind of unknown where they go) and I'm not sure if this would be negated by having the tank temp the exact same all year 'round, but could be stressful. Also, Scalloped hammerheads LOVE to eat stingrays. IMO Leopard sharks are gorgeous and would be a terrific addition.