I picked the UCpk-PRBaryta-cool-2880 as well as another profile and finally succeeded in getting a B&W print.
I can't say I am impressed with the documentation provided by Quadtone.... all the documents are rather dated, and none are very specific to Lightroom. All the profiles have fairly cryptic names... some are easier to decode than others. For example. I have no idea what UCmk vs UCpk means. PR? M? H (Hahnemuele?), and so on. I use the Hahnemuele Photo Rag Baryta which perhaps is the UCmk-HPhotorag series? I don't see a profile for Epson Exhibition Fiber, which is disappointing.
Perhaps my B&W needs aren't sophisticated enough to justify the effort and confusion of sorting out Quadtone, but I would love to be convinced.
Happy to hear from sympathetic users with Quadtone experience.