Hi Griff,
Just for your peace of mind, shark eyes are much better at detecting motion and contrast than human eyes. They almost certainly see you well before you see them. The University of Miami (Florida, USA), years back, did some neat research with divers in the water, a high observation post and a sonic "shark call" that drew sharks from a long distance. The sharks would come straight in until they were just ouside visual range for the divers, then start circling. Often the divers never saw them.
I'm like you, spearing in poor vis makes me very nervous, but I suspect it doesn't make much difference to your chance of having an incident. Of the three times I've had really scary run-ins with sharks, the vis was 7, 10, and 50 meters. Visibility was a factor in the latter two cases but only because it gave me a chance to react, I don't think the shark cared. Of course, I don't have to contend with GW, that would sort of change the mindset.
Good luck and dive safe.
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