QTR-Quadtone RIP

I've recently started using QTR for printing monochrome prints and I'm finding that my prints suffer from a slight greenish/yellowish tinge when using the UCmk-EVelvetFineArt-warm curve. I'm using an Epson 3800.
For the sake of comparison, I had a friend print the same images using ImagePrint and the prints did not show any noticeable color shifting.
I'm not advanced enough yet to start creating my own curves, but I was wondering if there was anyway to minimize the metamerism using the QTR canned profiles.