Best deeper-water snorkeling sites in the USVI?

We will be on a bareboat charter in a week and a half and we love snorkeling. Where are the best spots for more "adventurous" snorkeling around the USVI, maybe with a little deeper reefs, bigger views, and bigger fish? For example, I love the Indians and the deeper reefs off of Loblolly in Anegada, but obviously we won't be getting there. I get that there might not be an Indians-style setup with mooring balls, but even if someone wanted to free-snorkel off the boat....any suggestions?

Carvel Rock
Cow and Calf
west end Whiling Cay
Reef Bay
French Cap
Savannah Island

Pull up and maximize Google earth -- You will see some good ideas to explore.

On the east end of things around St. John - Pelican Rock, Flanagan Island, Leduc Island, Booby Rock off of Salt Pond, Tektite/Beehive Cove.

Cheers, RickG