Digital BW, The Print

Hi folks,

I noticed in my black and white prints I've been spitting out from 
the Epson that there is a very faint and unnoticeable banding(?) or 
light lines of dark especially in the darker regions of the picture. 
The line doesn't go across the whole print but could it be the result 
of the microweave setting?

Or is this due to the natural grain of the paper? I used both EAM 
where it's worse and the Photo Rag which is marvelous but much more 
fainter. So is EAM worse than Photo Rag for masking very faint 
banding.

I did re-align my printer head in a check. I'm not sure how tolerant 
it was but I also found out that the "banding" is a lot worse on the 
high speed setting which I did spit out like 20 prints accidentally 
on that setting without knowing.

Any clues?

AW