Digital BW, The Print

About six weeks ago I switched fro the original piezography inks 
to the the new Piezotone inks.  Initially I was very pleased that my 
prints weren't continuously changing color and the new tone of 
the inks is much closer to the way my wet/darkroom prints look.  
The blacks are better and I didn't have to wait two weeks for the 
print to stabilize although it never really did.  Recently I have
been printing a group of images that have a lot of subtle 
variations from the midtones to the 3/4 tones.  What I am noticing 
is the new inks don't have as smooth a scale between these 
tones.  The prints are showing noise or clipping between these 
tones.  I was wondering if anybody else was experiencing this 
problem?  Do the new selenium inks do this as well?  I would 
greatly appreciate comments on this.

Thanks,
Michael

www.michaelfaye.com