I also have been hitting walls when it comes to finding parentage and relations to my Ruoff relation. I am not sure if we are directly related, however you indicated that you were able to find many cousins.Maybe in your research you might have come across relations or connections to my Ruoff relation. Here is what limited information I have:
Amelia Ruoff born November 6, 1858 at Wasseralfingen, Wurtemburg, Germany. Somehow she met a man named Emil Kettler, Sr. Emil Kettler was born December 24, 1847 at Oldenburg, Germany.Amelia Ruoff married Emil Kettler, Sr. on March 4, 1881 in Los Angeles County, California. Amelia Ruoff Kettler and Emil Kettler had nine children. Amelia Ruoff Kettler died July 29, 1935. Emil Kettler died January 17, 1932. Both died in Los Angeles County, California.
I heard once that there were Ruoff relatives that lived in California they were called the Ruoff Cousins by the children of Amelia and Emil Kettler. When asked about further information or details, no one was able to give me any more details or names about these Ruoff relations. I am hoping to be able to find out more about her and her connections. Maybe you will be able to give me some suggestions on how to find more information about her family and ancestry. Looking forward to hearing from you soon.