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The best avise that I can give you, it seems you have already discounted. Waiting out whities is far and above the best way to get a big one. This is from 40 years experience hunting them.
Yep, sitting in a tree is usually the best method for whitetail. Save the spot and stalk for mule deer, they are slower and have lower IQs.
My observations are a Whitetails nature is to run (to the next county) when it is scared or spooked, a Mule deer runs off 100 yards then stops and looks back to see what it was that spooked them.