QTR-Quadtone RIP

I am looking for a little help getting started with my 7000 and 
running the Cone/Sepia set of inks.  I am not looking to change ink 
sets as I have customers that are looking for that tonal range in 
their prints. I am currently running Image Print with these inks but 
due to their lack of support for these inks and Inkjet mall also not 
supporting that set up, I am looking for a new solution.  

There are several dither patterns to try. In my limited test, I have 
not been very satisfied in the smoothness of tones. Since I am seeing 
so many users claiming happy results, I thought that there may be 
something that I am missing.

A quick search in list archive of Cone Inks and 7000 only came up with 
one message. If you can point me to previous discusions that would be 
great too.

Thanks
Eric