QTR-Quadtone RIP

Attempting to do an ICC profile of the Arches Smooth paper, I ran 
into a problem.  In printing the 51 step profile, the deepest black 
patches remained visibly wet for a minute or two after ejection from 
the printer--literally pooled on the paper. After trying different 
paper types, as well as a 15% ink reduction in the Epson driver, I 
was unable to address the problem. The result is that there are 
reversals at the black end of the scale that QTR Create ICC 
apparently could not
handle. For example, the 92, 94, 96, 98 and 100% blacks show LAB L 
valus of 19.39, 19.06, 18.70, 18.95 and 19.39. (Below 90% the data 
looks linear.)

With this data, QTR Create ICC introduces a *full scale* spike into 
the shadow end of the correction curve with a width of about LAB L 
zero up to about 8. The result is that this prints out almost pure 
black. Oddly, the Soft Proof view using the same profile and BPC 
checked looks normal. Perhaps someone has an explanation.  I am using 
QTR Creat ICC 2.3.0 on a PC.

Thanks,
Walt