>>I started barking like a dog, this just caused them to look at me [:@]

They were probably looking up the tree thinking, "Now how the heck did that dog get up there?"

I try and wait them out or throw sticks, barks and try and hit them. I have also seen a buck stumble on a couple of sticks and scare himself so badly he jumped straight up and run a few steps.

I think if you spook them once it isn't so bad, but if you get them used to getting spooked from your tree, find a new spot.