QTR-Quadtone RIP

I just installed QTR.  My plan is to use the Epson inks (or maybe
MIS black?), but otherwise have a dual purpose color/b&w printer.

I have a few really basic questions.

-1- I've  been using the C86 and MIS EZ inks on EEM. How should
QTR results (with Epson UC inks and EEM) compare (generally speaking)
with what I've been getting. In other words, as I tweak, what should I be
looking for? Any known glaring differences I just should expect and
shouldn't worry about.

-2- I use PWP (PictureWindow Pro), not PS. Should I just save a
grayscale to a TIFF and use QTR GUI to print?  Are there other options
using PWP?

-3- I stupidly installed the Epson Photo Black. I bought the Matte
Black. I use windows XP, but having read of Mac issues swapping
the inks, is there anything I have to worry about using XP?  Also,
can I save the Photo Black cartridge, and if so, should I do anything
to preserve it (baggie, skotch tape, etc.?)

-4- With the MIS EZ system, I use M-W, Y-W, C-N to get a mostly
warmish image. Is there some curve combination (if I have that lingo
right) that I can use to get approximatley the same tonality?

Very impressed with QTR's setup and what not. I'm also impressed
with the level of expertise I've seen on this list and on DBWTP, but
I'm hoping to get some decent results without too much teeth pulling :-) 

Thanks much.

Scott