Thanks for this perspective. Out of interest, have you dived Bikini recently? I only asked because I spent quite a lot of time at Truk recently focusing on the deep wrecks (IJN Oite (62m, very moderate penetration), San Francis Maru (57m - light penetration through the aft and forward holds) , Aikoku Maru (56m - moderate penetration) and Amagisan Maru (53m - moderate penetration) as well as a bunch of wrecks in the 40-50m range where we got right into the engine rooms. From what I've read the penetration in the wrecks in Bikini will not be as extensive as what I've experienced at Truk?
I have no desire to climb through wrecks into tight engine rooms at 50m+ on air. In fact, I simply won't be doing that. But if the diving is no more technical than my experiences in Truk then I think I would be better off on air on open circuit where I have experience instead of on a rushed Mod 2 on a unit I only have ~50 hours on.
I would be diving with Dirty Dozen.