I did come across this page that helped a little but didn't resolve the problem completely. Its not for our system but some of the information is good
http://www.oce-dgs.com/PrinterSupport/CS74xx_Customer/Documentation/TN%202746A_Tips%20for%20Corrugated%20Plastic.pdf
Unfortunately it's not just an Agfa problem. We installed a Vutek about 6 months ago with the sole intention of printing on corrugated plastic only to find exactly the same issues you have found with exactly the same response from the the supplier. NOT HAPPY !!!!!
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