Has there been any progress on this?
I've been experiencing a number of issues with banding using the P800 with QTR for diginegs for Pd printing. The banding is clearly evident in the digineg in consistent midtones and sadly in the resulting Pd print. I'm using the front loader in the Poster Board mode (to avoid pizza wheel marks) with a backing board (tried two thicknesses with no difference in banding results). I'm using the latest OS X version of QTR on El Capitan and I'm printing on Pictorico OHP. And I'm printing 2880 dpi uni-directionally. (For what it's worth, I also tried printing at 1440 and there was no improvement.)
So anything anyone can share that might be useful, I'd be very interested to hear more.
Thanks,
John