You're crazy and just need to be patient because Aggressor is a quality organization and you're going to have a blast.
That said, I don't think any of your concerns are not justified. You're paying big bucks for the trip, and even at their discounted prices you deserve answers. The Baja Aggressor had dropped the ball on at least one of their Guadalupe trips that I'm aware of, but other friends have come back with stories of great trips. I'm suspect they compensated appropriately and don't want to have any more bad juju circulating around, so keep calling them. Maybe its just the holiday season that messed things up.
I would recommend that you put all your requests into one simple, straight-forward email, with numbered line item questions. This makes is much easier for them to reply directly to each concern or question and not ignore any of them. I lead trips and often get bogged down with people who send me numerous emails for weeks and even days before a trip with trivial questions (although no less important) about stuff that is usually already printed somewhere in the documentation I already gave them. I know that's not you, but now I tell everyone to do it this way and you're more likely to get your answers. If you really get impatient, send the same email one day later with "2nd Request!" in the title. That usually works for me.
So enjoy this pre-trip time thinking about how completely amazing Socorro is going to be in January. Clear water, lots of mantas, dolphins, sharks, maybe even whalesharks. I'm going back for my 7th or 8th (lost count) Socorro trip in April and I can't wait.
Here are a couple of links to what you'll probably see:
Revillagigedo (Socorro) Islands, Mexico (I'm the one with the big camera)
Socorro Island Manta Diving (my slide show from several trips ago)
Diving with Mantas at Socorro Island (one of my favorites. This was in January several years ago)
Diving with Hammerheads & Mantas at Socorro (January 2007)
Please let us know how the trip went.
Bonnie