Have you extended your search into surrounding counties of Harrison and Clarke which Floyd used to be part of before 1819 and into Kentucky? Also have you checked church, cemetery and census records for any Tates in the surrounding area? My William Tate came to Huntington Co. IN from Vermont via OH and I can't find anything on him before OH. He worked on the Lackawanna Railroad. They are an elusive lot that didn't leave many clues. Hope this helps. Pam