I understand your frustration. I don't think anyone is looking for you to get hurt. You set it up, get in, and see how it feels. If it doesn't feel right you make an adjustment and try it again. You can probably do this in 30 min or so.
Now obviously if your back is real bad maybe that's a concern. I just think that trying to rely on some mathematical formulas to tell you how to hang when there are so many other variables that come into play is going to put you in the funny farm. What happens when you've got it nailed with your trees exactly 10' apart and you get on the trail and end up with the closest trees being 20' apart? I guess you can whip out your netbook and re-run the calculations but you're better off figuring out what you need by look and feel rather than what a spreadsheet tells you.
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