I have studied the Family Tree at your website and find that he has much in common with mine. As far as I can tell at this point we don't appear to be actually related, but have many relations in common.
I'm directly descended from the Guthries of Largo (my mother was a Guthrie) and also related to the descendants of Robert Guthrie and Margaret Lawrie or Laurie m. 8 Sep 1843. I'm also related to the descendants of Thomas Sime and Helen Guthrie (my great great aunt). 5 siblings and 2 sons of Helen Sime nee Guthrie emigrated to New Zealand between 1860 and 1891. There are numerous descendants of the Sime brothers in NZ who will all be related to you. You don't have any of them on your tree. Other names I have in common with you include Clunie, Tivendale, Balfour, Simpson, Melville, Hutton. N.B. My Largo Huttons are maternal relations, my paternal Huttons were from Ayrshire and no historical relationship is known between them.
I have not been able to raise you at the email address noted on your website so hope this will get to you.