Digital BW, The Print

Hello,
I use the CFS system with MIS VARIABLE TONE B&W INKSETS (
with Paul Roark Workflows and Epson driver) in my Epson 870 and paper 
Epson Archivial Matte. Others setting:

- Color Space: ADOBE RGB
- I use curves NCA for Epson 870 and "no color adj." on Epson driver
- I calibrated the monitor with Photoshop (I haven't problems with 
this configuration for others prints)

My prints are too light e with low contrast, why?

Thank you

Stefano