If you always print at 90%, you could increase the left margin setting on your layout to center your report.
Enter layout mode and select Layouts | Layout Setup... | Printing.
The margin sizes will use whatever units you last selected for the Object Info Palette. If you don't want the units you see in Layout Setup, close the dialog, bring up the Object Info palette and click the units in the Object Info Palette until you get the units you want. Then go back to Layout Setup... to adjust your margins.
Thanks! That did the trick!