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One possibility would be to create two views with the exact formatting you want and then use the technique described here (http://kb.tableausoftware.com/articles/knowledgebase/creating-sheet-selector-for-dashboard) to swap the views based on the parameter. On the negative side it means you have to maintain two views. But on the positive side you can really control exactly how each view should work given different measures.
Thanks Joshua. It's an alternative that I'll explore.