Digital BW, The Print

I am printing with the MIS VM inkset on a 1280, initially on Museo but soon
on Somerset Velvet and Enhanced.  So far the results are fantastic, but I
have a few questions.

The settings Paul Roark specifies include printing using the "Photo Quality
Inkjet Paper" setting (which limits you to 1440 dpi.)  Is there any reason
(other than time) not to print at 2880?  Will doing so change the densities
and necessitate a modification of the curves?  Has anyone tried printing
with the "Photo Paper" setting, which allows 2880 dpi?

I am most interested in "watercolor" type papers (heavyweight, fairly
rough.)   Does anyone have any recommendations?

Bill Morse
PhotoProspect
Cambridge, MA 02139