My 8th ggm is Tabitha Fulham Hunt Whitney b 1696 Concord, MA. Looks like your same line, as your Whitney ancestors are from the same area. From that same line, the original Whitney immigrant from England, John Whitney b 20 Jul 1592, was actually the founder of Watertown, MA.
https://en.wikipedia.org/wiki/Whitney_family
Direct paternal line starting at your Whitney-5385
Elijah Whitney Jr (1755-1842) m Lydia McElwain (1709-1769)
Elijah Whitney (1707-1755) m. Rebakeh Winship (1709-1769)
Isaiah Whitney (1671-1712) m Sarah Woodward (1675-1715)
Thomas Whitney (1627-1719) m Mary Kettle Kendall (1630-1719)
John Whitney (Principle Founder of Watertown) (1592-1673) m. Elinor Arnold Braye (1599-1654)