Digital BW, The Print

I downloaded the demo version of ImagePrint and straightforwardly 
printed an image that I have previously printed with the Roark 
workflow with Quadtone inks.  Among the subtle differences between 
the two resulting prints, there is a very noticable difference in the 
darkest portions of the two prints.  

The subject is wearing some dark, pleated trousers.  On the 
ImagePrint print, the blacks are pretty good.  The pleats show up as 
black and the other portions of the trousers are a different but very 
dark gray. On the Roark workflow print there is still some small 
concentrations of black where it should be but in the same area there 
are some portions that are not as dark.  The effect is that of globs 
of black on very dark gray.  On close examination of the print, this 
looks terrible.  Any suggestions?  If I could do the Roark workflow, 
I would prefer that a whole bunch.  That $500 could easily be spent 
on some other toy.

Thanks in advance