Digital BW, The Print

I have recently begun printing with the UT7 inkset (using Eboni 
Black) on the Epson 2200. So far, I have had good results using Paul 
Roark's Slider Control settings in the printer driver (using 
grayscale files) and disappointing results with the UT7 Curves 
downloaded from MIS (using grayscale files converted to Adobe RGB). 
I've experimented with different 'Print Space' profiles, with no good 
results. Invariably, the density, highlights and shadows shift when I 
print with the UT7 Curves, yielding unacceptable prints. I would, 
however, like to use the greater range of tone options offered by the 
curves files. What am I doing wrong?