QTR-Quadtone RIP

I have made several curves for other papers and this paper is giving me a  
problem that has not occurred before. I am running an Epson 2200 with K7  
inks. I printed the ink pattern page from the calibration mode with the  
ink calibration slider set to 100 (all the way to the right.) I looked at  
the steps and determined that I was getting the max black at about 45 and  
that above that there was no increase in black level. There was, however,  
no decrease either. I reprinted the page with the ink level setting at 45  
and then used that to determine the densities for the 7 channels and then  
printed the 21step.tif file. The last two steps at 95 and 100 are lighter  
than the 90 step and they are lighter than what the blackest ink was  
laying down in the ink pattern page. When printing the ink pattern, it  
would stay completely black beyond 45 all the way up to 100, so I don't  
think the 95 and 100 steps of the 21 step strip are lighter due to over  
inking of the blackest ink. When I look at the curves, I see that the next  
to darkest channel, Lt Black, has an overlap with the darkest black all  
the way up to 100. Actually, at a binary value of 255 it is at 0 but at  
254 an under, there is some Lt. Black being layed down along with the  
Black. I believe that is what is causeing my last two steps to be lighter  
than what they should be. How do I control the overlap? Any value entered  
in the overlap setting inceases the overlap. I need to decrease it. I have  
tried all kinds of variations, and I can't figure out a way to reduce the  
Lt. Black overlap with Black. I could go into the .quad file and edit the  
values directly, but there must be a more elegant solution that I am not  
seeing. Can anyone tell me what I am doing wrong and how to get the deeper  
blacks that I see on the ink patter page printouts.

Thanks,
Steve


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