I don't know if you used it without success or if you don't know about it, but have you tried Genweb?
http://usgenweb.org/ Each county has a web site and you should be able to post a request there for info from people that are doing a similar search. A search for Lewis Baker on the Clarke county Ohio site turned up 700+ hits, although "Lewis Baker" returned none. Another free site that lists multiple resources is Cyndi's
http://www.cyndislist.com/ . If you don't find anything at first, keep at it through the years and sooner or later you may just run into someone with overlapping branches and get a windfall. I got lucky by finding a self published book on my lineage through contacts on a county Gen Web page. Good luck.