I should've mentioned, the extra gfci outlet is in addition to the
existing outlets every 3-4' along the backsplash. I had it added with
the undercab lights in mind. I think I'm going to tie the lights
directly into the existing gfci box, remove the outlet itself, and put
a plain stainless plate over top. Much easier than installing a new
hidden outlet down below, etc.

Thanks everyone!