Bruce,
I know you were the one to ask the question in the first place.
This is getting stranger by the minute: you come in asking about other wrecks than the King Cruiser, and that was easy enough to answer.
Then you come back and you talk profusely about wrecks on the other side of Thailand, most of them well beyond recreational diving levels, a responsible instructor should pay attention to what he says, especially when posting on a forum which is well frequented by beginners as well as more experienced divers.
It is very difficult to find Nitrox in the Andaman Sea, you probably know that, let alone use rebreathers, even on Phuket.
As for Phuket: Sea Bees and Kontiki often share the same boat in high season, I see no reason why they should do differently during low season, which boat did you go out with?
Who were the guides?
Do I sound suspicious?
Yes, I am; this looks to me like a big invitation: come to the Gulf of Siam, things are so much better than on the other side!
The more I talk to people like you, the less I'm attracted to come and see Samui, Koh Tao and the rest.