How to increase the PDF417 resolution

Our PDF417 barcode is not as crisp as we want it.  Initial PDF output, the barcode will scan, but we do see minuscule white horizontal lines.
We are producing the barcode via a tag using the Type = Barcode and Format = PDF417, Length = 31, scale = 1.  Font = PDF417 300dpi 12x16.
We were asked to increase the ECCLevel, but I don't see a way to do that unless I ditch these features and use the CreatePDF417Barcode rule.
Anybody have any thoughts?

If you haven't done so already, you should review the Implementing PDF417 Barcodes manual - http://docs.oracle.com/cd/E51709_01/pdf417.pdf
The most reliable bar codes are produced when you use one of Documaker's standard print drivers (AFP, Xerox Metacode, PCL, or PostScript) to produce a print stream that is sent directly to the appropriate printer. Bar codes scanned directly from these printouts are more reliable when scanned because...
• Documaker completely controls the print stream produced
• The printouts are of high resolution (240 or 300 dots per inch)
• Most AFP, Xerox Metacode, PCL, or PostScript printers are very reliable and consistent
You lessen the reliability of scanned bar codes when you...
• Produce bar codes in an alternate document format such as PDF, RTF, or HTML
• Fax the bar code
When printing a PDF file containing PDF417 barcodes, make sure you do not use any "fit to width" or page scaling options when printing in Adobe Reader/Acrobat or use similar options in your Windows print driver.

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