QTR-Quadtone RIP

Hi all,

I just purchased an Epson R2400 and thought I'd give QTR a whirl 
because I'd heard such good things about it during my research. I'm 
pretty much a printing profile noob, and I'm not sure I know exactly 
how to use this thing.

The first b&w print I ran through QTR came out very muddy and blocked 
up. My Settings-> Name: Stylus Photo R2400 / Model: QuadR2400 / Paper 
Type: Matte / Resolution: 1440 super / Speed: Faster / Dither: 
Ordered. I made no adjustments to Curves or Ink Limit or Gamma.

The second time, I kept the basic settings the same and changed 
Curves to a blend (50) of "UCmk-EnhMatte-Cool" & "UCmk-EnhMatte-
Warm" - thinking this might be the best way to get a "neutral" print. 
The print came out much better- but still looked a tiny bit muddy to 
my eye.

Have I just gotten to the point of trial and error? Is there 
somewhere that explains (preferably with samples) the various curves 
and blending modes of the curves (the included help doesn't really 
explain them that well)? Gamma Adjustment? Ink Limit Adjustment?

What I'd really like is a default neutral black and white 
profile/setup for a well exposed black and white image on matte paper 
for the R2400. Or advice from someone who has done a lot of b&w 
printing on a R2400 with QTR.

I apologize in advance if these questions are answered in a FAQ or 
Manual somewhere that I just haven't seen yet.

Thanks,

james