I use the hybrid side of a les lat slurry stone to make a really watery slurry like I would on my kiita with tomo nagura. Mine will get VERY sharp like this. I dilute some but don't finish on water. I dilute as if I was using a soft thuringian, not all the way but just enough where it looks cloudy.That edge is rally taken to the limit. Nice images in your link.
The last time i used my hybrid i tried to use a La Lune slurry stone. The JNAT tomo i have is too hard, and did not work well with the stone. Now i am considering getting some softer JNAT Tomo naguras to play with on the hybrid.
The La Lune slurry did speed up the stone, but i had better results just using it after a 10-12 synthetic stone.
I just feel these stones does have more versatility and potential then i have ben able to get out of them. I guess you have showed that in your post.
I will try some Shiro Suita as a nagura on the stone and see how it behaves. I try to avoid releasing too much grit from the base stone by using softer naguras.