It's quite unclear to me why you have these larger fonts, could it be that it comes from a Windows system setting?
If you like to test a bit you can you can try the following:
Make a backup copy of the looks-2.0.1.jar file in your phex installation folder
Download this file:
http://svn.sourceforge.net/viewcvs.c...0&pathrev=3332
Rename it to looks-2.0.1.jar and place it in your phex installation folder.
Then you can check if you still have the same font troubles. At least there seem to be some font troubles with Windows ME and Vista in this library.
Gregor