Done a few more tests for the night sky, and... That was a bust. I may try later if I can think of anything else. But it looks bad(too stretched out). I did improve the skymap by upscaling it and then blurring it a little so there are no visible bands. I shall continue improve it visually(now I want to fix the weird yellowish light during early morning). And see why only on some boats the caustic/water shimmering happens and in others doesn't.
