I think you have a few things mixed up. After the bevel stage, the edge coming of a Coticule with slurry, will not pass the HHT.
Here's an excerpt of
this article:
[note]Bevel correction on a Coticule.
A Coticule contains garnets for abrasive medium. When we moist the Coticule's surface and rub it with another piece of Coticule, garnets are released into the water. The resulting abrasive milk, greatly enhances the abrasive action of the honing. For this purpose, most Coticules are sold with a small "slurry stone" to raise the abrasive milk. For bevel correction purposes we cannot do without it.
Raise the slurry to the aforementioned milk-like consistency and commence with the use of half strokes. (refer)
Perform about 30 laps on either side of the razor and probe with the TPT or TNT for progress. If you don't know how to read the those test, you can also check if the razor shows any sign of responsiveness to shaving arm hair. Repeat the 30 laps on either side over and over again, and keep checking for progress. You may have to repeat this 2 to 20 times, depending on the initial condition of the razor. If it takes a long time, watch the width of both bevel sides. If they start showing unequal width, spend extra laps on the narrowest side. Once the edge gives a "sticky" response to the TPT or TNT along its entire length, or if it starts shaving arm hair, you can finalize the bevel correction stage by performing 30 full X-strokes. Do not allow the slurry to become too dense, because this has a negative influence on the sharpness that can be reached off the slurry stage on a Coticule.
The edge is now ready for refinement on the next hone in your progression. If you want to upsurge the keenness off the Coticule, before stepping up, you can perform about 50 additional laps on a thinned "misty" slurry. Results varying between different Coticule specimens, your edge will now be able to provide a mediocre shave. You can either divert to the Unicot or Dilucot method to get more keenness, or you can progress to a fine synthetic hone in the 8000 to 12000 grit range. After that it's still possible to finish the edge on the Coticule, water only this time, to enjoy the gentleness of the renowned Coticule edge.[/note]
Kind regards,
Bart.