Chuck, no answers re shore diving, but you've inspired three questions from me, please:
(1) Do you know anything about Cabo Pulmo Divers (Castro family)? They were highly recommended to me by a Mexican Tourism Bureau guest speaker here in Dallas. They seem to rely for information and reservations on a U.S.-based property mgt person who doesn't do email well. This individual claims there are no reliable phone lines in Cabo Pulmo?
(2) Would it be better to arrange through one of the C.S.L. shops for dives up the east coast, or take my chances in driving up there myself to deal with the locals? (Spanish-fluent, "ain't skeered" )
(3) Is it worthwhile/feasible to cross the Sea of Cortez to dive San Carlos, on the mainland?
TIA! Looking forward to your trip report, as I'll be there in early September.