RE: How high is too high?
There is such a thing as too high. Depending on terrain, you can get to a height to where the angles get "worse", or more severe, with each inch you climb. In a perfect set-up, all shots would be flat. However, we all know that getting up in a tree conceals movement, scent, and sight. Once you get high enough to achieve this, I feel you are only hurting your chances by ascending any further. There is not a harder shot in archery than shooting straight down on a deer between the shoulder blades.