SUCCESS!
After ALL this time I've got him! Another researcher (HURN) has doggedly pursued Joseph while trying to sort out his own Norfolk family. Yesterday, Mike sent me four more generations worth of my HEARNE family!
Joseph, bap. 1 Sep 1789 Southrepps, was the son of Thomas HERNE and Mary ROBINSON.
Thomas, bap. 26 Dec 1756 Sheringham, was the son of John HURN and Uriah/Ursula MASON.
John, bap. 25 July 1731 Edgefield, was the son of Thomas HERN and Mary [unknown].
Thomas, bap. 14 Jul 1695, was the son of Thomas HURN and Elizabeth [unknown].
Thomas, bap. ca 1660 Edgefield.
More work to do but this info is amazing!
Thanks again to everyone who helped with this search!