Today a few hours back there is good doc posted byWilliam Aubrey which is very informative in explaining how the text tables need to be presented.In this workbook he also addressed how to do custom formatting of cross tabs. i think if go through that workbook you will get the information which you are looking for.
Please go through the mock axis and dual mock axis dashboards for your query
Thanks for the reply! It looks as if I can't open the workbook you referenced me to. Getting an error saying the workbook was created in a newer version of Tableau. I'm on version 9.1, so wasn't sure if there was a way around this or not?