Text formatting is one area that doesn't work so well, or not at all with Captivate. About the only thing you can do is to get it reasonably correct on one break point, and then right-click on your text caption or shape containing text and select Apply text and text properties to all views. It should look reasonably okay on all breakpoints at that point.
Then go here:
http://www.adobe.com/products/wishform.html
and submit a feature request for improved text formatting and paragraph spacing. Maybe one day your and my wish will be granted.