The middle of the three vids is really the only one that offers much to see. Like JPEnge, I really only see issues with the kick. And since you're training for a 5k open water swim...IMO (which I think I share with others) you don't need a particularly strong kick for that long of a swim. You do however want to maintain a good, streamline position in the water. Personally, I only kick enough to 'feel' the surface of the water, and keep my body level. You seem to be doing that. But, in your case, you have a bit of a scissor kick happening. Try to concentrate on keeping your legs closer together as you kick.
Dan
The middle of the three vids is really the only one that offers much to see. Like JPEnge, I really only see issues with the kick. And since you're training for a 5k open water swim...IMO (which I think I share with others) you don't need a particularly strong kick for that long of a swim. You do however want to maintain a good, streamline position in the water. Personally, I only kick enough to 'feel' the surface of the water, and keep my body level. You seem to be doing that. But, in your case, you have a bit of a scissor kick happening. Try to concentrate on keeping your legs closer together as you kick.
Dan