I don't know if I would be of much help. I can trace my ancestors on the Plyley side to a Henry Plyley who died in 1796. He had the following children: Casper (born 11 Feb 1763 and died 28 Mar 1849), Henry, Magdalene (who married Philip Gunther), and George. Unfortunately, I have info only from the Casper line.
If I can be of some assistance, my email is
hoy@msmisp.com David E. Vaughn