HP 10000 color issues...

[Drewsoul]

Hi all!
My name is Drew and I am new to the site. I have search all over for a solution to an issue I am having, and here I landed.
Let me explain my current setup:
Corel Draw X5/Adobe Photoshop CS4 to Onyx Rip Software to HP 10000 6 color DesignJet Printer.

This machine prints very well, especially the more it prints. But my colors aren't accurate at all. Blues are purple, greens are browns, etc.

Can someone with more experience shine some lights on the subject for me? I can use colo corrections in the rip to get a closer color, but I want files to print as they appear when exported.

Any help is greatly appreciated!
Thanks,
Drew