Digital BW, The Print

If you can give me a little more info, I might be able to help. This 
same thing comes up with the color channels too, even more so when you 
start using odd inks like I do.

What I need to know is, does QTR linearize each channel, and then you 
make the mixing partitions (resulting in a final linear "color"). Or do 
you make the mixes and then linearize that resulting "color". Sorry I'm 
not as familiar with QTR as I maybe should be, but I use a different 
RIP.

Obviously you want you full black to run up to full density (or your 
target density), so there isn't much to do there.