You have done excellent research here. I have two Abbotts in my family...
A Mary Abbott who married Augustus Tibbs (son of James Tilley Tibbs) born in 1831 in Trinity, Newfoundland.
The other is Ann Abbott who married a John Butler in 1864 in Bonavista, Newfoundland. I'm not sure if she is my gggrandmother or not. Still trying to trace my ggrandfather's family and I know his father was a John.
I am also wondering if you know if any of these Abbott's are of Mi'kmaq/Metis or English background? From my research, I have read that the Abbotts of the northern part of the Island were Mi'kmaq and those in the southern part of the province were English.