Digital BW, The Print

I have an Epson 1430 with Eb 6 inks.  I can use the Epson driver and the profiles from Paul Roark to make reasonable prints.  However when I use the curves downloaded from the same source the prints show banding and seems to show excessive contrast.  

I am saving the file as a grey gamma 2.2 tiff and then printing it using the appropriate EB6 curve but without smooth transitions between tones.  Could there be something I am doing wrong?

Thanks, in anticipation.

Michael