Digital BW, The Print

It seems that the quality of the image depends on the gradiation of 
tones of the original photo. I can print a daytime with a ncw Roark 
curve and everything if ok....but putting the same curve on a night 
shot with street lights does not work....I am thinking of switching 
to an inkset that I can print directly from the grayscale image. 
Piezography?....Is it possible to have a profile created so I can use 
the UT inks withour converting to RGB and not using a curve...I 
understand that any variable control would be lost...Thanks, Robert