I assume you're printing from a Mac, what OS are you using?
When printing thru QuadTone RIP, the Epson driver settings are not available to select, so if you are selecting a media type setting in the Epson driver, then I suspect you're not choosing your K7 printer model or printing thru QTR correctly.
Please refer to the New Piezography Manual, starting on page 12, where it explains how to use the QTR Print Tool, to pages 13 + 14, where it shows how to go from Print Tool to QuadTone RIP to select the Piezography paper curve and resolution settings. To have the 9890-K7 printer and QuadTone RIP available to print thru, you must first install the 9890-K7 printer by following the Mac QTR installation instructions, starting on page 7 of the Piezography manual, and more information and curves specific to the 7890/9890-K7 setup can be found here: http://www.piezography.com/PiezoPress/technical-support/epson-7890-9890-installation/
To print Piezography inks on Pictorico film, you will want to use our Digital Negative ink shade placement (including shades 2.5 and 4.5). To print positives on film, use Methodology 1 ink shade placement and curve (follow the Meth 1 printing instructions on page 33, but don't invert or flip the image as you would if printing a negative). To print negatives for developing in the darkroom, Methodology 3 is best, and we offer a few curves with different film bases. You can certainly try printing on film using the standard K7 ink shade placement, and a glossy-K7 curve, to see if you're satisfied with the results, but we feel the Meth 1 ink shade placement and curve produce the smoothest/best results on Pictorico film.
When printing on any glossy, semi-gloss, pearl, satin or baryta paper surface, you will want to use the appropriate Piezography gloss curve specific to the printer model/family and paper you're using. A second printing of Gloss Overprint must be applied after the ink has been printed and dried. Piezography gloss printing instructions start on page 19 of the New Piezography Manual.
QTR now supports both 8 and 16bit images, but for the bet results when printing with Piezography and QTR, you should print images with an embedded profile of either Adobe RGB (1998) or Gray Gamma 2.2 (this is explained on page 10 of the Piezography manual).
I hope this helps. Best regards and happy printing~ Dana