White balance looks great.
I'm axious to get my GH5 into cold water this weekend (conditions permitting).
The settings choices the GH5 are almost overwhelming relative to my Canon SLR so it's interesting to see what has worked for you, particularly given I dive in similar conditions (Monterey). I would not normally consider auto ISO as an option for example.
Also, I had not encountered the shutter angle option (thanks stphnmartin).