I'd try re-injecting epoxy into the soft areas. If necessary, drill new holes between the old injection holes if the old repair has failed in some areas. I don't know if I'd try a total deck repair on these hulls, but some folks are confident that they can repair anything "fiberglass". I believe in the quick fix, first. (I'm the kind of person that will stick a baked bean can on a failing exhaust pipe just to get another year out of it. By then, the muffler is gone, too!)