I dove Kona in June with Big Island Divers. They were a good group but they stuffed 12 divers plus a couple of Dive Masters on to a boat that would have been comfortable with 10 divers total. We were on one of the smaller boats out there. Any of the outfits that advertise a lot were running cattle boat operations - you know who I mean.
One thing Big Island did was take our gear after each dive trip including the final dive, clean it and dry it. I just picked up the gear on the way to the airport. It was nice and dry.