QTR-Quadtone RIP

I  had stubborn banding in dark areas. Here's what worked for me, in case it helps anyone.

Using:

QTR 2.6.1
Mac/ 10.5.4
CS3 10.0.1
Epson 2200 w Epson inks (matte only)

Okay. We're talking about faint but clear banding in line w/ the printhead, showing up only 
in deep shadows. Cleaning, aligning etc. didn't help. I followed advice in this forum -- 
switched dithers, resampled to 360ppi and 720 ppi, switched between 1440-super and 
1440 regular. Various combos did help, but nothing worked completely. Adding gaussian 
noise to the shadows also helped, but weakened the deep blacks.

Solution: Print at 2880 dpi, even though the profiles are designed for 1440. (I use the 
stock QTR profiles) Printing at 2880 made prints come out very, very dark w some 
'bronzing" (or whatever you call it where parts of the print look splotchy from some 
angles). To compensate for the darkness/splotchyness, I set "ink limit" to a whopping -42.

It's not graceful but it worked. No splotches, and the final print is very close to what I was 
aiming for. 

Naturally, am very interested if anyone has better ideas or if I've missed a better solution. 
thanks and best.