I never gave it much thought, but...
I own a Norton 5K stone. I believe it to be the SHAPTON professional series Wine 5000. I believe that people have expressed a certain dislike in general for this stone with a strong like for the 6K glass stone that I have never tried. I will admit that the 5K stone can be a bit temperamental for me, but I always assumed that it was my inexperience.
See https://www.shapton.com/traditional-series
From there, I jump all the way to a 16K glass stone.
After the back is flattened, I hollow grind, so I have always made this work, but, it occurred to me that I might want to put another stone between them. I was thinking about a 10K shapton glass stone since it is my primarily what I use and I like the no soak part. My other water stones I do soak, but they are used less.
I did consider the Sigma Power select II at 10K.
Any thoughts on which would work better on PM-V11 from Lee Valley?
Any thoughts on inserting the 10K into the mix?