I see you are in the same boat as I am. Although your quest is much,much easier than mine. Anyways, I have if not most of the answers to your questions about the Ulberg family. Email me at firstname.lastname@example.org
so I can help you locate your family. My little brother is married to an Ulberg and yes, they are from Vaiusu, Faleata. Hope to hear from you soon.