Hello Bobby Orr,
I am a descendant of William Orr son of James Orr, Esq. and Mary Russell. William was born in 1756 and died in Ohio in 1815. He served in the Revolutionary War in a Ranger company on the Pennsylvania frontier.
James Orr was a person of some stature. He was from Northern Ireland but I haven’t perused investigating him.
The time period you are investigating in Raphoe is a difficult one. The area first grew rapidly but then collapsed due to the cratering of the Flax economy, followed by landlords attempts to restore their wealth by pushing tenants out and becoming more engaged in pastoral agriculture. Mass emigration then began to gain momentum in eastern Donegal well before the Great Famine.
At some point, I hope to visit the Linen Hall Library in Belfast as it may have relevant records of my Donegal ancestors who followed after William Orr. Perhaps Linen Hall May have something for you too.