Do you know Jim Beloff? He has been one of the biggest proponent of the ukulele over the last 20 years. He has published The Bari-Best and two 365 songbooks for the baritone ukulele: The Daily Ukulele Baritone Edition and The Daily Ukulele Baritone Leap Year Edition. See the Amazon links on the side bar and take a look inside.
Check out this article in which he shares some new information about chords that you may find helpful.