I have a NA-RX100II housing on a flexitray II + handle and one Inon Z-240 strobe on each handle at the end of (5"+8+) arm assembly. Today I took my rig in the pool to familiarize myself with it. My take away: it's harder than it looks.
One thing that got me puzzled was how much I should tighten the clamps. I found that if I tighten the clamps hard enough for the rig to be semi-rigid out of the water, the arms would be obviously impossible to reposition UW without first loosening the clamps. No big deal, except that fine tuning the clamps underwater might not be the righ thing to do.
So what do experienced photographers do with their clamps? What's your "clamp workflow" for in-boat->diving->back-in-boat?