I saw your querie about Martin and Andrew Strang of Orkney. I too have an Strang ancestor from Orkney by the name of Maxwell, but I have nothing to connect him to any others in Scotland. He moved to Kingston, Canada where his descendants, Maxwell Strange and Dr. Orlando Sampson Strange, also lived.
I am sending this from the library and do not have my info with me (I was researching another family and decided to check out Strang/Strange). Have you checked "The Stranges of Balcaskie" by John Mayer? I have it on order but have yet to receive it. It may lead to some connections. I will send you more info later.
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if you have any leads or connections. Good luck.