OCE TD400 & Wipeouts / Text masking

I'm trying to implement the use of Wipeouts and text masking in my new
company, but when I plot dwg with the Wipeouts in them they still show up
with a very light dither effect, although they aren't bad when the dwg is
plotted , they are noticable and will defintly show up if the plotted dwg
and run through a copier. What settings are optimal for making wipeout
invisible. or is this plotter limitation, I've set the Graphic section of
the PC3 file to Vector 6xxxx gray scle color - somthing like - the highest
available, Raster to the "best" setting and Lines to "Over write". anything
I haven't found yet? TIA

 

The Drivers are installed via the network, I did down load the latest
HDI drivers and installed them and the Windows Raster drivers, but the
OCE has to 2 setup / settings on our network, if I use the "Cad Setup"
I get the same problem (even after the new driver installation) if I
use the "Windows Setup" - I lose the necessary paper sizes for Acad
(Arch "Expand" mainly) I wonding if the server drivers were updated if
that would fix this issue. I did try to use the "Windows setup" we
have in conjuction with the new OCE windows drivers I installed on my
system, and though it does fix the wipeout problem it lacks as I said
before the (Arch "Expand" paper sizes). The drivers I got of the OCE
are 3.2 or higher for Acad 2000-2004. Hope this is enough info. TIA