My mother's genealogy work connects us intoCharles Hoag,son of Solomon Hoag and Mary Jane Cushing. She also shows Solomon as the son of David Hoag and Patty Haviland. She shows 7 children from a first marriage with Susan Haight and 5 or 6 from a 2nd marriage with Sarah Tanner.
She also thought that on the Haight side of the family there was a connection with Susan Haight,but she didn't know what it was.
This info seems to track with yours. If so maybe we could trade more info.