If one is already getting the DMax and contrast one wants without the Fumed silica, are there any other benefits besides not needing to use as much coating solution? Basically my pt/pd prints already look like the one on the right. Though occasionally they have too much contrast (I use no contrast agent -- Na2, dichromate, Potassium chlorate). I use those negatives for carbon printing!

Does it change the surface qualities, for example? Mid-tones?