I think you should keep going! I started my research with tons of brick walls because I picked up where someone else ended. I will tell you I made cracks to the wall from others help.
I am curious after seeing online that there is a connection with your ancestor and rosa parks. Have you had much luck with any collaborations?
Have you tried to not so much research for awhile but just connecting? (chats, ims, emails, forums).
Sometimes someone maybe holding that piece of paper we need!