Digital BW, The Print

Hi,
I have been using the profiles from here and the ones included 
in the OPM for the 2200. While printing somes nudes with lots of 
subtle skin gradations I noticed posterization. 
Has it been there before and I didn't notice? I don't know.
It is especially prominent with the Neutral . If I need linearization, 
can someone direct me to a tutorial. Sepia is fine. Printing B&W 
with all the inks with epson driver is also fine.
Can anyone help?
Thanks,
Antara