This is a bit off your subject but I was very impressed by what you have done.
I am over here from London, studying in South Carolina, so there is a yet another coincidence as you have written some about Blakeneys much earlier in South Carolina.
I also noticed that you have been searching for a Charles, ygr bro of Ld Wm Blakeney, who d 1741? I have been looking for another Chas who would not be the right dates for your; however, another coincidence. The Chas I've been searching for was prob b abt 1735, though there is doubt whether in Culliogh, Galway--near where your Blakeney Castle was--or Weatherford, Roscommon--nearer to Greenhall where he was married 6 March 1761 to Bridget Gunning. My Charles died in Dublin, Dec of 1815.