Nice. If you're shooting in 4k, do you really need to export it at anything larger than 1080p? Depends on your (prospective) clients of course, but on laptops, tablets. etc. no one will really notice if it's larger. If 1080p was acceptable, you could experiment with zooming in a little in a few places now and then. You can have a 'close up' of a surfer/boat etc., then cut to the wider shot.
The third one wasn't as interesting as the first two TBH, but was a good example of smooth camera tilt control and a stable Phantom 3 in wind.