Digital BW, The Print

Does anyone have some ballpark settings of the Epson 1280 driver for 
BO (black only) printing.  I'm out of hextones and am awaiting a 
shipment from MIS, and I want to experiment.

Epson 1280, Epson Matte Heavy paper (supposedly same response as 
EEM).  I want to fool around with both the OEM Epson black dye ink 
and MIS Eboni.

I had beautiful prints with MIS VM.  Right now with BO I've got a 
nice looking gray scale when I print a step wedge, but things in the 
mid-high range (like flesh tones) are printing a "zone" or more too 
dark.  Brightness, contrast, gamma?

Also, do I need to mess with color space settings in Picture Window 
Pro?  I don't use color management, but I've got the working space 
set at Adobe RGB 1998 as per the hextone workflow.

Thanks,
--Peter