I know this is an old post, but you hit the nail on the head, as I am descendant from the Lynches and Mulvaneys (my grandma a Lynch and my grandpa a Mulvaney). They ended up settling in Bayonne, NJ, where our family likes today. The remaining Lynch familes ahve moved on toe Meath and Navan and the Edenburt property was sold out by my grandfather's older brothers and their families long ago.
However, there are many of us in the United States and I am finding new distant cousins al the time.
I am interested in the Sweetman Irish-American program and will have to check that out.