QTR-Quadtone RIP

Hello, I tried a test print using Quadtone Rip on a Epson 2200 and on a 
Epson 4000 printer.  The print from the 4000 printer is beautiful and 
the print from the 2200 is pretty bad.  I am confused why I am getting 
such different outputs from these two printers.  

Everything I have read seems to indicate that I can use the Epson 2200 
as a B&W printer using QuadTone Rip.  The settings are the same on both 
printers in the GUI.  I am using Epson Enhanced Matte and the curve I 
am using is UC-EEnhMatte-cool.

Is it possible that Quadtone Rip does not like Epson's Matte ink?  
Should I switch to the Photo Black ink?  I was hoping to make the Epson 
2200 a dedicated B&W printers using a CIS system of some sort but if 
the results don't improve the printer will be on eBay soon.

Thanks in advance.
Mark