P.S. Btw, I saw some pix of longimanus off the kona coast, and I maust admit that with such a crystal clear and deep blue water the scene is quite perfect...
I think the chances are good IF you can get one of the good operators to take you out. Problem is the operator I used all the time (Dive Makai) got sold so I don't know if they are gung-ho about it now.
I saw whitetips following the pilot whales in crystal blue water off Kona Coast as you say, but I didn't have a camera then and even if I did others on the boat were nervous and wanted to leave.
So you would have to arrange it with a group you know and that might be expensive as Hawaii is expensive.
What is good is that they don't attract them with food (that is illegal in the US) or anything there, a few whitetips always follow pilots. So as long as the marine mammal protection act is obeyed (not harassing dolphin/whale/keeping distance), it is a great place to see them - not responding to bated conditions.
I've always had good luck diving off Kona & I love it, but again my fav operator has changed hands so I haven't been for a couple of years.
Best, Carol