Did you try other shots from the same spot at a slightly different angle showing more coast line and less horizon?
This, this, this.
They are some very nice photos of some beautiful locations - but the horizon is pretty much dead center in all of them. I guess you could say that it's generally accepted that a centered horizon (splitting the frame in half) can hurt a composition. I'm not saying it should never be done, some scenes call for it (I think #10 works well like that actually) but on #1, 2, 9 and 11 I would have liked to have seen more foreground, less sky. I also think you should invest in a a few split ND or graduated ND filters since these scenes would have been perfect for them (to darken the sky a bit) and would have maybe saved you time on processing.