Digital BW, The Print

I cant solve the Microbanding problem! ive tried alot and hav no idea 
wat else i can do!
her is a pic of what comes out of my printer on epson matte 
heavyweight paper at 1440dpi with pauls carbon curve
http://www.jsfotografie.de/epson.jpg its heavyly oversharpend but i 
guess you can see the bandings very good... what i find strange is 
that if you take a very close look at the right side after the big 
ugly band there is no banding! ARGGGG and the guys ofer at MIS dont 
answer me if i got a bad cart

regards Janosch