Digital BW, The Print

I'm new to QTR and am using v2.1b and the QTRgui interface on a 
windows XP machine with a 2200.  I'm using Epson mk inks for now.

I just printed an image on 13 X 19 EpEnhMatte paper using the 
UC_EEnhMatte-warm tone curve, with ink limit slider set to 20 to 
deepen the shadows a little bit.  I used 1440dpi and "better" 
settings.  In the setup I fed the paper narrow edge first, but told 
QTR it was landscape so I could print on half a sheet (image size was 
8X10).

This is a portrait of a small boy with light features against a black 
background.  In PS, the blacks are totally black (100K) and I saved 
the file as a grayscale TIFF with embedded gamma 2.2 profile and 
without LZW compression.

When it printed, I saw noticeable banding in the solid black area 
(pure black to perhaps zone 4 or 5).  The bands are not totally even 
in width and are about 1/2" wide, fading in and out, almost like 
venetian blinds out of focus way in the background.  It is not 
clogged nozzles, and besides, the banding is parallel to the long 
edge (opposite of the travel of the rails the ink cartridges are 
mounted to).  I checked the image in PS and the info palette shows 
the entire area measures 100K.  As a reality check, I printed the 
Image using ImagePrint and there was absolutely no banding.  

I'm a little stumped.  I love the quality of the image printed with 
QTR, with the exception of the banding.  The banding only shows up in 
the solid black areas, not on the child's face, hair or clothing.  I 
printed it a second time and got the exact same pattern in the exact 
same locations.  I even shut of my computer and cold booted it and 
the printer to be sure something wasn't corrupted.  

Any thoughts?  It wouldn't be 1440 dpi instead of 2880 would it?  I 
really love this product and would like to get it working.

Thanks,  Lou