Nice location Grahame and I will follow your progress on these shots as we have very similar coastlines to work with and I'm a sucker for a good seascape. I don't think that you went too wide
My thoughts on #1: I want to suggest that you shift your viewpoint to the right but then you lose the impact of the distant island I think. As others said maybe the elimination of the coral formations on the right and shift your position to the left and hope for some lovely foreground pools like you have in this one.
On the second shot I think that the distant island would look great dead center horizontally if you are lucky enough to get clouds like that. I also agree that more foreground and less sky might have more impact.
You could always try a multiple shot pano with a few portrait oriented shots and see what happens when you go really wide and stitch the shots!
Good luck on Sunday!