Chris, what did you use to WB off? A white/grey slate or your hand or something similar?
I am off to dive with the Great Whites in South Australia in 2 weeks so i'll be shooting with the 7-14mm also.
Mostly the palm of my hand, but the shark belly works too. The hand is nice because it has a little bit of yellow and magenta in it such that the WB doesn't go too far. I am trying to come up with a good white balance card that would be good for different depths; I made one up last year and it worked well for some depths but not all.
Why such a high range of ISO? Did you want to ensure the apertures were small to have corner sharpness? Seems like the conditions in your video were ideal
Shooting at 96fps mean the shutter speed should be about 1/200, and I also wanted to be able to shoot at f/8 or f/11 to make focus easier. For a static subject, not to important, but you can't exactly place the sharks where you want them.