Great to hear fom you. I'm not sure that I have any additional information for you. I too have the list of descendants that you have however no more.
I am descended from David James Kinghorn & Helena White Taylor, son of David Kinghorn & Margaret Reid. I have a copy of the Mathieson family tree but it does not include my ancestors (born too late). If I can supply any info about my twig of this tree which is of use to you I am happy to do so.