Your testing is too limited; okay so you have a fairly round view of your ethnic makeup. This is based more on the statistical data of your ancestor's migratory background. It is not genetically specific. It's like saying: "Gee we know that some of us came from California, while passing through Utah." But what county in California? What city? What Street? And can we find others with the SAME information? No. ALL you know is California.
You mention Zachariah? Did you know there are three distinct Zachariah Isbell DNA groups with six Isbell family lines? Unless or until a male Isbell takes the FTDNA test, you're wasting your time. The paperwork helps you find your relatives. Genetic DNA matching CONFIRMS if you are related.