I have found that if you go to small with Moki hooks the catch rate of small ones greatly increase. When the fishing is slow catching small ones is a bit of fun but can be a bit tedious if they are plentiful. Most of the time I use a Mustad Ultra Point Demon in the 3/0 when targeting them (could be 2/0 would have to check).
But using a 4/0 or 5/0 with a large piece of bait is good when Rig are also about and would eliminate many of the smaller Moki.
Have you ever caught a legal size Butterfish Ginga?