Digital BW, The Print

My name is Rick and i'm a member of the digital rebels groups.  I own a Canon 20D and 
would like to take my prints to the next level. I own a epson 1280 photo printer and the 
prints come out awesome. I finally bought the spyderpro2 calibrater and calibrated my 
monitor.  My color prints come out fine but my black and whites don't print as they appear 
on the screen. They usually have a cast not true blk and wht.  My settings are as follows in 
photoshop.  ADOBE RGE 1998 / COLORSYNC GRAY-GENERIC GRAY / DOT GAIN 20% / I 
KEEP ALL IMBEDED PROFILES.
Can someone help me get nice black and whites without converting my printer system to 
total black and white inks?

Thanks Rick.....