You have already identified the problem - 'no visible sign of steel coming off'. Increase the pressure and number of laps until you can see deposits in the water or on the surface of your hone. You will also learn a lot from the marker test as it's very common to have a razor where the spine is less than perfect which will cause problems on the blade edge. You can also spot this in the form of uneven wear if you are using tape.

If's that is the problem you need to search the old posts for a remedy or start a new thread.