Unfortunately I'm not sure what can be done besides the workarounds Jonathan listed in that GitHub issue, Lisa. We're pretty much stuck with what Tableau Server provides at this point. It'd be nice if VizAlerts could convert a series of PNG files into PDFs--you might be able to avoid this, and other formatting issues that way.
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Take a look at the other part of the solution described there: embedding the view inside a dashboard that has a fixed size.