I was having a similar problem, to which you replied earlier today. Is this on “screen design” viewer provided by the Eclipse plugin side-by-side with the XML editor, or are you encountering the alignment problems when actually running the app? If the former, that appers to be a bug in the plugin, if the latter, try adding:
android:scaleType="fitStart"
From the documentation I’ve read, that seems to be the closest to what you need.