Printer issues with IPlot

We recently rolled over to V8i SS2. We are using an HP Color Laserjet 5550 dn printer for all of our 11x17 sheets.  The PCL6 driver is loaded for the HP and IPlot V8i is loaded on the plot server. When we print from IPlot or from the Ogranizer it cuts off the top border line of the sheet. If we toggle off Use full paper size the entire sheet is printed but then it is not to scale. Any ideas?