Changing the font size on AP checks

So we have our default font size set to the delivered value of Courier New (12).  But all of the standard timberline check stock I can find seems to be setup to work with smaller fonts. WHY?  So I would really like to have the description show on the check stub.  But right now invoice numbers are potentially 15 characters so that only leaves about 3 spaces for the description.  We order check stock from forms fulfillment... I thought maybe I should order something different from somewhere else but I can't find anything any different. 

Have you modified your default font so that more fits on your check stub?  Or do you order your AP checks from another vendor that has better options to support Courier New 12?

I want more info on the checkstub but not sure where to start.  Thanks......