QTR-Quadtone RIP

My prints on a 1270 using Eboni Black Only have a loss of shadow detail 
compared to the MIS UTS-FN inkset using Paul Roark curves. I have also 
printed BO on a R200 and there is even more loss of detail.

Is there a way to control shadow detail when BO through 
brightness/contrast?

I it possible to control shadow detail printing black only with QTR, 
and if so what is the setup?

thanks in advance
Keith Prue