Hi,
Could you give this a try:
For each model/layouts, go to the page setup and select "DWF6 ePlot.pc3" as the Name of the plotter and then set your other settings accordingly. For those model/layout page that you leave it as "None", it will use the settings within the "Preferences.xml" file.
Location of "Preferences.xml" file should be at:
C:\Documents and Settings\
\Application Data\Autodesk\AutoCAD Vault AddIn\Objects\Preferences.xml
--
Kit
Ying Kit