QTR-Quadtone RIP

Hi all,
I have installed the 3-MK ink set on my R800 using the MK, PK, and GL
positions of my printer. With this setup I've read, I could still
print color on matte papers. For glossy I had to change at least the
one eboni for the PK ink.
I print B&W using this setup and the QTR and I get fine results.
But my printer doesn't print color any more.
Actually, all I want to do is to print text with color images on a
plain paper. I choose "text and images" and 'Fine" or "photo" setting
on the Epson driver, but the print comes out black only!
Any suggestions?
Thank you for your feedback,
Zisis