Nice images. I am not troubled by smooth water. IMHO, it's fine if it isn't overdone and contributes to the visual image you want.
I think #3 is the most interesting and #1 the least. In the case of #3: I personally like the little rapids at the bottom. They provide a nice anchor. I however, I think the image lacks contrast. I would brighten the shadows a bit, impose a curve to increase contrast (while anchoring the brights so that they aren't further brightened), and add a little local contrast. A very quick-and-dirty yielded this:
I'd crop the second a little from the bottom and a lot from the top, maybe something like this: