I tried again last night with the 60mm and cmc-1. Getting a gauge as to the best subject size for this combination of lenses. Tried variations of MF and AFC with tracking. Couldn't get the latter to work at all probably due to the shallow depth of field. I'm using one area focus. I'm sure it's probably a familiarity thing, but when I get the camera underwater it doesn't respond like it does when I'm sitting at home just going through the settings! I tried AFC tracking on a hermit crab and the camera failed miserably. It would lock onto something when I was just trying to get it to auto focus!
Anyway, that was me screaming underwater in case you were wondering. Onward with the learning!