I'm pretty sure the HHT is only supposed to be used after you are done with the 8K side of the hone. I believe it was Randy who made sure to bring that up whenever someone talked about performing the HHT after every set of honing.
Search for the paper towel test by robert williams a.k.a. papabull. It is another test that you can do to determine sharpness of a cutthroat razor.