A lot of us here use Brian at Island Ventures:
http://www.islandventure.com/contact.htm
Phone: 305-451-4957
Toll Free: 1-866-293-5006
He'll be able to direct you to 100% if he doesn't do it himself, and camping.
We've seen solo divers go down with 4 tanks on the Grove a couple times, and I've never been limited on 6 trips (5 to the Grove) except by my computer. It would probably be a good idea to check with Brian in advance, of course, if you are looking for an "extreme" adventure requiring deco lol.
They have two boats and I've only been crowded once on a three-day weekend trip (go figure lol). I've often been with only four or six, so you may be able to get your own boat. Get 4 more (maybe from this board) and you'll get 10% off everything.
Like most operators, Brian works from his cell phone so if you want to have a technical talk with him it I'd suggest you arrange to call back when he's not driving.
I've been with Slade as well. From what I hear there aren't really any bad operators in the Key Largo area, so you're likely to be safe regardless of who you dive with.
Others here will know the alternatives there better than I do, but I enjoy the Duane and Bibb quite a bit. I'd rather dive the Duane than the Grove again, any time.
Your second dive might be either a shallow reef or another shallow wreck like the City of Washington. I'd prefer to dive one of the reefs given a choice - better camera weather there in my experience.