I'm trying to print a nice Navy Blue color, (ST21-J, ST21-K, ST22-J, ST22-K, ST24-K, PR24-K, PR25-K, & PR26K in Roland Color System Library) and I manage to get different shades of purple, not blue.
So, I'm printing using GCVP, High Quality, 1440x720 dpi, CMYK (v) W-PASS, Halftone Dither...