The group of volunteer researchers there have a remarkable level of skill in Norwegian genealogical research. Many of them are Norwegian.
You've done a fantastic job organizing the findings to date. Once you have every drop of info you can gather in Australia, you might want to post your query in Norway-Heritage forum. That forum, which has existed for fifteen years, will be closing in 2013, so the window of opportunity for getting help there is closing soon.
I hope that some of the volunteer researchers there will continue their assistance to descendants of Norwegian emigrants via Genforum.