Digital BW, The Print

I have an Epson 1280.  I used up the supplied Epson color inks and 
then switched to MIS VM.  On Paul Roarke's recommendation, I've been 
using the Tyler Boley curves.  On Epson Matte Heavyweight they seem 
to work well without tweaking (at least by my eyes).  However, I 
recently compared some B&W prints done with the color inks to the MIS 
prints.  The blacks were noticeably blacker in the color-ink prints.  
So by going to MIS VM, I've lost the "greenies and magentas" in 
various densities, but my blacks aren't quite as rich.

I think somebody mentioned a while back that they were using some 
version of MIS Quad or Hex inks with the Epson black ink.  Supposedly 
this gave better blacks.

Could someone confirm that this combination works well, and tell me 
whether you had to tweak the curves to accomodate the Epson black?

Thanks,
--Peter Klein
Seattle, WA