QTR-Quadtone RIP

> I see from your thread below that you received no replies, and was
wondering whether you 
> had been able to find a good solution offline yet...

You can eliminate bronzing and gloss differential by adding a
cartridge with gloss optimizer (glop).

I once made some curves for the MIS PRO ultrachrome equivalent color
inkset with glop in the yellow position. 

Those curves are still available on my site:
http://daniel.staver.no/content/download/451/2130/version/3/file/2100-mis-pro.zip

However, you can easily modify any existing curve to use glop as long
as it's placed an ink position not used by the curve you're modifying.

In the Curve Creator, choose 'Load curve' on the ink channel with the
glop, click 'Curve', click 'Point list', and enter pairs of point
values starting from white to black. I used 0 60 100 30 Which outputs
60% glop in the highlights and 30% in the shadows. You may have to
experiment with other values to see what works best for your inkset.

If you go too high you might oversaturate the paper with ink,
resulting in mottling, ink smears and loss of detail.