Very interesting! I had not heard of this 1792 list. Where is it located?
I am not so sure that treatment in Louisiana was much better than Virginia in 1792 since many free African Americans still owned land in parts of Virginia and North Carolina at the time and Louisiana thought it necessary to list them separately. There are few separate lists in Virginia from such an early date. Most start about 1800. It was not unitl the early 1800s--say about 1825 and especially after Nat Turner's rebellion--that conditions for free African Americans in Virginia and North Carolina really became oppressive.

I noticed that Natchez, Mississippi, also drew many from Virginia and North Carolina. The Winn and Gibson families of Virginia were there about 1812. The motivation for their movement to the area may have been the same as that for whites: large areas of land were available at low prices.
Paul