Someone else will chime in , but the big shops are MDA (Micronesian Divers Association) and Axe Murderer Tours . They are both kind of geared to locals doing self-guided dives on the buddy system from a charter boat as opposed to tourists taking DM guided dives. Obviously they do get some tourists using a Divemaster , but my guess is that is probably 20 percent of their volume with locals generating the 80 percent. I have heard of MDA forever (and it is the bigger outfit ) but I dove with Axe Murderer since at the time it seemed they might be more tourist friendly. I dove with them in late 2019.
Axe Murder accommodated me fairly well , but I think I was grouped with 3 other divers with fairly limited experience each day plus the divemaster. One day we were on a charter boat with 8+ locals and another day we were the only divers on the boat. I kind of served as assistant divemaster. Given we were the only tourist divers( who were paying for a DM as opposed to self-guided) on the boat it kind of was what it was. Only alternative would have been to request a private guide in advance (and obviously pay for them )
I think there is also decent shore diving there if you are with a local (but some of it is fairly unprotected, so you kind of want someone who understands the weather/currents ).