QTR-Quadtone RIP

Hi everyone. This is my first post as I have just joined to see if
anyone can help me. Although I have been photographing for some time,
printing does not come easy to me and I feel rather helpless and
stupid most of the time. My problem is that my pure whites print gray.
I have a MacG5 running OS10.4.6. I am now using QuatoneRIP 2.3 after
using and earlier version which gave me no problems. My printer is an
Epson 1280. I think I am setting everything up per the tutorial,
although this I am not too sure about. I have tried adjusting the ink
limit and the gamma with no difference. In fact when I convert the
image from RGB to Grayscale the whites are a darker gray. Does anyone
else have this problem? Anyone have an idea of what I am doing wrong?
Thanks so much.

Crawf