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I agree that most likely you need some additional work on the 4K.
But either way, 20 on the coticule (with water) is not enough, in my experience.
You need at least 50 strokes back and forth. 70...

First off, allow me to state that I am totally opposed against rating the Belgian hones with any given grit-number. The coticule has a median particle size of 15 micron. A blue has a median particle...

Many ways to skin a cat.

With slurry, a coticule cuts very fast. The result is very smooth, but the free floating garnets in the slurry also affect the very tip of the edge, by "micro-rounding"...