No I have not used a Nagura stone on either of these and do not plan to. When I get to these really high grit finishing stones I am not looking to make them cut more quickly because my edge is already very smooth and sharp at this point. The smoother the cutting action of these stones the better for me, and all the evidence seems to indicate that the stones leave a smoother scratch pattern when used with just plain water. I do use rubbing stones to refresh the surface of my finishing stones (coticule and escher) from time to time to extend the amount of time between lappings on the DMT.