QTR-Quadtone RIP

Hi all!

I am new to the QTR. Therefore I have several (or a lot of) questions.
I have read the manual und I have searched already this groups and the
Internet, but I found nothing that answered my question(s). Perhaps
somebody here is so kind to help me. 

I am using since 3 years a EPSON 2100 with CarboPrint inks from the
German company MONOCHROM and the Hahnemühle PhotoRag-paper (HPR). But
this became to expensive and there was no CFS for this inks so I
stopped using them.

Here are my questions:

1.) Why are there no curves for HPR in the 2100 settings? Or in the
other way: Why don´t all printers have the same amount of curves? 

2.) I found curves named UC*, UCmk* and UCpk* in the settings for the
2100. "Mk" is matte black and "pk" is photo black. Does it means I can
use matte black ink OR photo black ink for a curve named UC*?

3.) What can I achieve with 3 curves? Will the blending be more
smooth? For example I used the UCmk-EEnhMatte-cool-curve with 75% and
the UCmk-EEnhMatte-warm-curve with 25% using HPR-paper. What will
happen if I use cool 75%, 15% neutral and 10% warm?

4.) I am testing all the new and fine barite and barite-like papers
(Hahnemühle FineArt Baryta, Harmann FB, etc.) with the pb ink. But
even with a complete 100% cool-curve all these papers have a more or
less brown tone/touch. Did somebody experience the same?

Thanks a lot for your answers!

CU

Peter