Digital BW, The Print

I'm using the MISS quad tone set w/ an epson 1280 on epson archival 
matte, windows 98 and photoshop 7. I consistantly get prints that 
have a solarized effect (muddy highlights and midtones, lacking 
contrast), with the dark blacks printing dark purple/blue. I've tried 
printing files with known results on other systems w/ the same 
results. I wonder if I have an incorrect printer setting? Also, is 
image, mode, grayscale the correct grayscale conversion? Thanks, Craig