Hello Ryan.  I don't know if I can be of much help to you.  I found a small cluster of McGilvays following the mariage of Mary MacKenzie and Alexander Brown about 1806.  A granddaughter, Marion Brown, married Neil McGilvray.  I have a few names for the next two generations but, unfortunately no dates.

Do you have any details on your Campbell ancestor?  I am particularly interested in Flora Campbell, 1753-1848.  I have never been able to find a link to her.