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When you say that everything is working great, have you actually been able to generate and view a .ps file that contains a label with your barcode on it? Are you sure that the problem you're having is CGI, or is it that your postscript file isn't actually correct?
I ask because it seems the PostScript::MailLabels does not support embedding graphics. Take a look at the documentation "todo" section to see that it is planned in the future. So it appears you're just loading up a text field with data that has no hope of being interpreted as a graphic image.
If true, you may have to do your own label alignment code.
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