QTR-Quadtone RIP

I'm asking about this approach to getting the best color output out of my
R1800 due to the knowledge of those that use different ink sets in their
printers for optimal B&W output.

I've printed out density charts using the various paper options in the
latest Epson Driver for my R1800 to see what is the best paper/ink mode for
Epson Premium Glossy Photo Paper prior to printing out targets for profiling
with an i1.  I'm using MIS UC inks.

Best result was with the paper selected as Premium Presentation Matte in the
Epson driver with 2880 dpi.  Two problems (both due to matte paper selection
for a glossy paper) are with the driver using MK instead of PK, and the GLOP
option being grayed out.  

It's easy to overcome the MK / PK ink use by swapping the ink cartridge
positions and their chips.  Will this be acceptable due to the ink / driver
differences?

Is there a way to force the application of GLOP with the matte paper
selection?  Or do I have to run the print through again as a white only file
with a glossy paper and GLOP selected to add the GLOP?  I can reprint with a
white only file with glossy paper and GLOP selected, but only with GLOP as
auto -- full won't print.

Any suggestions with details would be appreciated.  I'm on a Windows 7 64
bit machine using PS CS5.

My other option is to use the Ultimate Premium Luster paper selection in the
driver as it is a better choice than the Glossy and Semi Gloss paper
selections when viewing the density charts.

Thanks,
Scott