I can go for the idea of Kevlar on the bottom, particularly in your area. I wonder though, if you need the carbon fiber in there, as it will not add to the structural integrity of the structure as described but it does add to the cost. One of the axioms of sandwich laminate construction is that you can have the load borne by the skins or by the core but not both. The failure mode of your "laminate" will be dictated by the "core" planking. And it won't add measurably to stiffness, because your "skin' is too thin to afford any stiffening. If you were to apply three or four layers of the Kevlar/Epoxy, you would change things, but you'd also add so much weight that you might well sail like a garbage barge. You may find that Kevlar alone is enough cheaper than the Kevlar/Epoxy to make the change worthwhile.
Fair winds and following seas,
Jim Waldron