The former wet cell Sci Anglers lines in sinking designs cut the wind very nicely. I have also never noticed ANY belly in these. They used to be called "level sink" lines and primarily were designed for lakes/still water. Not sure why you would want to stress a five weight with these, but that is your idea. They cast well, and go down at good rates with mending in moving water a plus, hope that is what you want in performance!
A wet fish is a Happy fish