Please note this is an old forum thread. Information in this post may be out-to-date and/or erroneous.
Every phpdocx version includes new features and improvements. Previously unsupported features may have been added to newer releases, or past issues may have been corrected.
Did you try this : http://www.phpdocx.com/archives/1888 ?
It can be a workarround if your text is on several lines.
For your information I am still waiting "spacing_top" and "spacing_bottom" options for addText function...