Thank you, Bill, for the explanation regarding a reflectance target, and for the kind wishes of ever needing just a one, single grade of paper. I hope I can get to that point at some stage, again. Again, because that's how I used to print 30 years ago, not by choice, except I like my current results much more.
At the moment, I enjoy the look of Ilford Multigrade Warmtone glossy fibre, processed in PF130 and Se toned, very much, so I am unlikely to change away from it. Also, while weaning myself off split-grade approach, I don't mind having the option of a very occasional burn-in with a different-grade.