I have a Hero 4-Silver and Backscatter 3.1 (I think). The one with two lenses (one side, one top). I think I just used the 5-20ft. shallow lens for most footage. It's interesting to see just how different the vids turn out, even mid-dive, as it changes from sunny to overcast above, and of course depth being the main factor. The shallower dives (under 40ft.) and sunny out, the video is awesome, detailed, colorful, beautiful. Being just your basic touristy hand stick and the high currents made some parts very shaky of course. Plus they were so bad on Santa Rosa Wall that you were basically "flying" by everything, and interesting stuff was just passing too quick to get good vid.
I guess I'm just use to the Keys where currents are almost non-existent in most of my dives, plus lots of shallow beautiful reef. Except the Spiegel Grove wreck, which almost swept two of the divers away, lol. That wasn't fun.
A dive light is my next Scuba gear purchase. The VL4000P runs around $360? How much did you pay, may I ask?