Ted,
Over several years my method for making sepia inkjets prints I've settled on two methods that tend to give consistent results over different printing sessions.
1) Convert the image to Grayscale, then to a Duotone using a Pantone preset, with 144 (orange) as the warm ink, the convert to RGB (Adobe) and print. I get good results when the system is color calibrated and I use either Hahnemuhle Rag, Moab Entrada, or even Epson Enhanced Matte. 144 tends to give a reddish-brown color reminiscent of a salt-print, 478 is more tame (brown-green) and might be what you want.
2) Use Quadtone Rip (QTR 2.2) for printing. I think I use a mix of "carbon" and "warm" for the prints, netting a chocolate brown color. The problem with this approach is NOT being able to preview the color before printing, nonetheless with a few experiments, I can get very consistent color. I tend to use matte papers, which allows for more choices using QTR.
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