There is lots of data on the Proctor family of Charles County, MD. If you are in that area, please try the local historical societies of Charles County, St. Marys County, and Prince Georges County. The family has spanned all of that area and even into DC.
One of Paul Heinegg's books covers Free African Americans in Maryland and the Proctor family is mentioned. There was another Proctor family researcher several years ago on this forum, perhaps she will see your post. There was an extensive article written on the family in The Washington Post maybe twenty years ago, that you might find helpful.