Digital BW, The Print

Try this forum:http://groups.yahoo.com/group/piezography3000/.

You will find that many users of Piezo's ICC profiles are having a 
great deal of trouble with black blocking up. For most this occurs 
at about 70 to75% on a step flat chart. you will also find that 
there is little or no support from Piezography with this problem, 
although they claim they will have a fix "soon".
OTOH their ICC inks and their Bright White paper give very good 
results when using Epson HW Matte as both the paper and ICC profile 
choice when printed on an Epson 1280.
Carl