The AOI lens is a good addition to GoPro gear. It offers sharper images, a wider field of view, and works perfectly with the 8:7 GoPro aspect ratio. After cropping, you can get great footage in both 16:9 and 9:16 formats. The only downside is that I used to always dive with the Backscatter Macromate (which is also very good), but now I can’t use both simultaneously due to the different lens mounts.
As for settings, 4K 8:7 at 60fps, then slow it down to 30fps. With almost everything set to auto, I can always achieve the colors I want in post-processing.