I am a descendant of this LOGGINS line as well. While I cannot assist you much with the determination of Reuben and Susanna's parentage, I would very much like to exchange information regarding our relative lines of descent. My lineage is through Henry's brother, Daniel LOGGINS.
I really disapprove of these Ancestry.com message boards as they do not allow for private response. Therefore, when (if?) you receive notification of the posting of this reply, please feel free to respond directly.
My address is Herman.May@earthling.net