Hey Joe, this looks like the extra ink there is not even related to the image? What interface are you printing through, and have you tried another...
I have, with limited success on the two 9600's I've owned. It sounds like yours is using the dye based inks, which are much less prone to...
I realize this may be a little late, but spot colors are controlled by your printing application (Illustrator, CorelDRAW). How well they render...
Service manual link: http://archivos.diagramas.mx/impresoras/Epson%20Stylus%20Pro%209000B%20Manual%20de%20Servicio.pdf