Digital BW, The Print

I am currently stuck in a dilemma.  I have an Epson 3000, with John 
Cone software, and MIS Quad Tone bulk ink sets.  I have been printing 
outputs for 3 months and have yet to produce an output that looks 
remotely decent.  I have been battling a problem called banding.  I 
have tried different software options, different paper types, 
cleaning, checking, checking, cleaning.  Finnaly I have spent hours 
on the phone with the Cone company, they tell me its the inks, MIS, 
they tell me its the printer, and Epson, they actually listen.  I 
have had the head replaced twice, the mother board replaced, and the 
tracktor feed motor replaced.  Nothing is working and I am beggining 
to think that the whole Quad Tone set up is a rag tag attempt at 
gerry rigging a printer to do something it's not supposed to.  Can 
some one please help me get rid off banding. I don't want to give up 
yet.  

Walter Scott Martin