So much of our history has been lost/neglected the slave issue misrepresented-as evidenced by comments made in the Convention alone,and it being a microcosm of the national discussion at that time. I find it interesting that the Smithsonian seems to be reacting to the current trends with its silly presentation of Jefferson the racist. Their image difficult to reconcile to Jeffersons draft -as you remind —and his notes on the State of Va. And the other side wholly ignores Mason-and any other who opposed the human trafficking.
Slavery and the Constitutional Convention could make a small book. IIRC one of the complaints in Jefferson’s first draft of the Declaration was the King imposed the vile institution on his colonial subjects while prohibiting it at home. Edmund Burke said the same to Parliament in 1775.