I think after sharpening 10 razor i have find why people used soaps while they sharpen the razor.Actually in last stage of sharpening.
I am sure many of you have or had experience with chinese 12 k.
while you hone blade after 80-100 laps you feel like blade sticks to the stone. to move it forward you will need to use more force.
I know many natural hones do this.
I did same experiement with this belgian coticule.
i sharpen the blade and it was in great condition. i checked the edge and i should say just strop and shave. i didn't stop in this stage.
i made some soap and put it on the hone . Interesting enough all tension was gone. Small details if you are putting too much soap blade just doesn't touch the stone. That is why you need to put not so much soap just enough which will take tension out. and do 25-40 more laps . i did this and checked edge again. it was very fine . i was worry about edge will brake down but it didn't.
i have not shave with that blade yet but when i do i let you know how it feels.
Just my 0.2 cent try this and see what happens on your coticules.
hope this helps.