Digital BW, The Print

(cross posted)
Hello list,
  After doing some reading, I decided to go with 250
gsm Museo for my final sellable/exhibition prints. 
However, after making some prints with my sample pack,
I noticed a sort of "water color" edge on some parts
of the print.  Basically, anywhere the image quickly
changed tone from light to dark, a very distinct hard
line appeared, like a water color filter had been
applied. 
  I'm using MIS pigs on a 1270 w/ NMC CIS on a PC &
PS6.  I tried printing w/ different media settings,
with the paper thickness switch set to +&0, with a
profile, w/out a profile, but it kept printing the
hard edge.  The same image on Epson Archival Matte
prints fine.  BTW, I'm printing with "no color
adjustment" checked.  I also did some print head
alignments to no avail.
  Has anyone experienced this with Museo?  Am I being
too picky? (it's small, but still noticeable w/out a
loupe) Or is this just a characteristic of cotton
paper, yet another "trade off" for longevity?  
  I've posted my scanned prints here:
http://www.tronicart.com/inks/museo.html
  Any suggestions are greatly appreciated.  If I can't
get this fixed, I'll try another paper.  Any
suggestions for a rag paper free of optical righteners
and available in 13x19, if possible?
  Thanks for the help!

 -Daniel Perez

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