You are absolutely right
Ive tried color flat profile for couple weeks and later grading with Davinci, but im beginner in color grading and i was frustrated for not getting good results and went back to Natural color profile, it seems a good compromise and minimal grading.
To do the Grading of White balance in Davinci i start by looking for a white object in video, and start from there (i even got color check card underwater but at deep of 20 meters its useless )
You also are correct about the lights, the divevolk has CRI 96 (excellent) and 5000 lumens, i need to use it in minimal settings that's about 1250 lumens and the color sometimes its a bit too warm in center.
I should get a second dive light, and move it away from the center of the lents.
But.... i dont want a bulky system
Ive test a full Divevolk kit with 2x dive lights with iPhone 14, + blackmagic camera app and was impressed with the results....but the iPhone dont have the gopro image stabilisation.
I didnt went with divevolk route, because the time ive tried it, all the dive i was too focus on video and less on the dive.... i want something simple that i can attach to the BDC, and if i see something interesting i will film it.
For me, first of all, its important to enjoy the dive, the videography its secondary.