David
Should I be using CS5 and no color adjustments in the Epson7900 driver, and selecting the paper profiles in Qimage to print...
Or use the Advanced B&W color controls in the 7900 driver itself allowing the driver to control and manage 'color' ?
I've no experience of printing on canvas with a printer like the 7900 with specialist B&W inks and controls but I've found having a good custom profile for the paper ensures good results for mono. This is on a modest R800 that has 2 blacks, Matte & Gloss, plus 6 other cartridges.
Perhaps you can do some small test prints on the canvas and which method looks the best.
Hopefully someone with more expert experience will chime in.
Terry