You are referring to generating a printed document rather than the user printing the topic, correct?
If you are using the project CSS in the last page of the wizard, try mapping to a Word template, you have more control by mapping the RoboHelp styles to Word styles and you can edit the Word styles. Not sure if that is the issue but it's worth trying. There is more about printed documentation on my site.
See www.grainge.org for RoboHelp and Authoring tips