Having spent 4 years there as a tech diver I would recommend Aarons dive shop for fills, Patricks diving adventures if you want a charter off the west side, Hawaiian diving adventures is good too. The best way would be find other tech divers still on the island and work out a charter out side of a shops. Shops will tell you that you aren't allowed which isn't true at all, they kind of bend the truth. Boats on the island require you have insurance, but there are many independent instructors that are insured that would be more than happy to get you a charter, won't hassle you about bottom times, and wont hit you with shady business practices. I have recently moved off the island, but you can PM me and I would be more than happy to give you contacts to local tech divers that can help set up dives. If you have to chance to hit up MAUI there is some great spots for tech divers, not much over head but deep spots.