I don't know if I will muddy up the waters more or what...I have Hiram Allen with two wives, first one supposley Carna Eilands, second one was Cynthia/Sintha Wafford/Wofford Cooley b. 1815 GA.Cynthia was married to a Wesley Cooley before she married Hiram Allen in 1842 in Jackson Co. GA. She had a son Thomas Cooley. I don't know what Thomas's middle name is.They lived in what was Jackson Co. GA at the time.I believe that Hall Co was cut from part of Jackson Co. but not sure.
But seeing the Wesley and Thomas names in your line of Allens made me wonder if there might be a connection. Hiram and his first wife had at least 5 sons that I don't have names for.They would have been born sometime between 1810 and 1840.The older ones would have been born in SC the younger ones in GA.
If you think there may be a connection, please let me know, I will be glad to share what info on the Allens I have.