I finally got back into my search after all these years and found your Post. I'm still searching for any information regarding Wnek and Plewa families in sayreville, and I've recently found a "corner" in my research. As far as I know, the people I'm researching arrived in America about 1906.
I'm living in Old Bridge and might have some information in which you might be interested. You can e-mail a reply here or use my personal e-mail account: email@example.com
BTW, do you have any information regarding the church records from either Lipnica Gorna, Lipnica Murowana or Lipnica Dolna in Poland?
Yes, I do have many relatives from South River!