I don't know about PMK - I've never tried it.
We were discussing Pyrocat-HD. My experience with Pyrocat and EI 400 films is that the combination produces fine grain (due in large part to the stain image) and high image acutance.
I prefer the results I obtain with Tri-x in Rodinal and Tri-x in Pyrocat-HD versus Tri-x in Microdol.
Are you developing Tech Pan in Microdol too?