Digital BW, The Print

I love the look of "black only" on Enhanced Matte, using my Epson 
2200 with standard inks and software.  I also love Hannemuhle Photo 
Rag 308 paper, but printing BO on PR gives me uneven streaks, 
expecially noticable in the dark tones.  The streaks run parallel to 
the print-head direction but it's not "banding" in the traditional 
sense -- it looks like you dragged your finger across the print at 
about 1-inch intervals.

I have tried various Epson paper profiles but it always looks the 
same -- admittedly, I don't have an official Photo Rag profile (I'm 
not sure there are any that don't assume you're using all 7 inks). 

As I said, the BO prints look great on EM, and full-color b&w 
looks "correct" on PR (just the usual issues) so I don't think it's a 
mechanical problem, just a paper/ink/software incompatibility 
somewhere.  

Can anyone provide help in printing BO on PR using a 2200?  Is there 
a profile that gives good results for this application?  Has anyone 
seen this problem?  Thanks.