Coming off an 8k Naniwa you shouldn't need that much to finish an edge. Drop the coticule, and the mud. You can get slurry dulling from a heavy "mud" and that's what I see from your progression. Your taking the Naniwa edge away and starting over.

I go from an 8k Shapton to a Nakayama Maruichi with a very light Mejiro slurry. Skim milk consistency would be heavier than I use. Work that light slurry diluting to water or almost water. Then Tomo Nagura as light or lighter than the Mejiro.... diluting to water. If you don't have the Mejiro, then work the Tomo Nagura a little longer while diluting. I'm assuming Maksim sent a compatible Tomo with your stone based on what you selected.

Once you leave the 8k Naniwa your not so much sharpening as refining the edge for smoothness and "some" sharpening.

If you're honing a dull blade with just Jnats, then Botan, Tenjyou, and Mejiro with a heavier slurry on the Botan and Tenjyou, diluting down can work, but coming from the 8k Naniwa.......you're going backwards with "mud".



Howard