Teegate,
My calculations put it in the same spot. The lidar that you and Boyd provided leave little doubt that you've found Reeve's Stone Island. Looking forward to hearing if the well at Herd's Cabin is lined with stone.
Incidentally, there is no indication that a person named Herd ever owned property in the area. During the last half of the 18th century, cedar swamps and pinewoods tracts were purchased at a feverish rate by wealthy entrepreneurs living outside the pines. But they needed men on the site to cut, haul, and saw the valuable timber. I think cabins (usually called cabbins in the old deeds) were quite common in the pines but must have been modest arrangements that could be easily moved or simply abandoned once the forest was denuded. I suspect Herd's cabin predates the iron era that started at nearby Hampton in 1795. There was a Homan's Cabbin near Penn Swamp below Quaker Bridge and a Burnt Cabin up the Toohawkin (no, not Tulpehawken) stream. I seem to remember seeing other references too. I will think on it.