Digital BW, The Print

Hi all, 

First a quick update, then a question:

I've got Roy's QTR software up and cooking under redhat 9.
Thanks to Roger Sopher and Roy for help and preliminary
installation notes. Installation was almost painless--we 
discovered one idiosyncrasy with configuring the CUPS printing
system, which involved changing some processing rules; I've
created a file of additional CUPS MIME rules that resolve 
the issue for me, which Roy and Roger now have.

I'm driving an Epson 2200 loaded with standard UC inks.

To get started, I'm printing tif's from Linux using the
qtcups utility, and the output is lovely. So far, I've sunk
about a buck (3 blank CD's used to burn the RH9 ISO images)
and 30 hours of sweat equity into this project. Not a dongle
in sight, either. :-) I'm using a worthless old PII 333 MHz 
PC to run RH9. 128 MB memory, 6GB HD.

Now my question: 

When I print the 21Step image using the curve EEM_2200-cool I 
see two very distinct hitches in the continuous ramp, one above
the 60% patch and one above the 90% patch. After running my first
calibration series last night, I got the same thing in my own
profile, shifted to slightly different positions.

Except for the discontinuity at those two points, the ramp
looks great, cool and smooth with delicate highlights and a 
velvety black at 100%. 

Am I doing something wrong? Do others see this? The settings I 
used were:

Dither: Adaptive Hybrid
Image Type: Photograph
Ink Type: Seven Color Photo
Resolution 1440x720 Highest Quality. 
Blend Curves 1 and 2: 100-0
Quadtone Rip Curve 1: EEM_2200-cool

-David