My wife and I will be diving with both Gabe at Kaimana and Lissa and Roger with Oahu Scuba Divers (both companies highly recommended) in Mid May. Because we haven't been diving much, and my wife had some less than good experiences a while back, we will only be doing shallower dives. Sounds like it will be the same stuff you will be doing. I will report back with our experiences. If you haven't heard from me, just PM me before you go.
BTW, Sharks Cove is supposed to be an awesome site, but only accessible during the Summer, due to surf conditions. We are playing it by ear this trip, but in late May it might be a very good option. Make sure and ask about it.
Regards,
Gary