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Hi @idc-staffer and welcome to TUC!
On drift dives with lots of currents, I’d try and find spots where the reef offers a bit of protection and take photos there.
When there is no such thing… then life is really hard!
I would give up on shooting macro in those conditions and focus on wide-angle or fish portraits, depending on your lens.
If I’ve seen spotted a nice coral formation from a distance and am drifting towards it, I know I’ll be only able to take a couple of shots before “flying past”, so I’d prepare my settings & strobe positions ahead of time (clamps tightened up), and also think of how to avoid bumping into said corals, when getting too close.
In terms of settings, strobes do a good job in freezing motion, even if you’re moving yourself, but I’d typically keep a shutter speed higher than normal, say 1/125th or faster.
Does this answer your question?
Let’s see if other members have thoughts to share as this is only my approach.