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That angle looks pretty good to me in the first pic. That curly thumb might get you tied in knots😀

Yes. Before you get in. Hard to do while hanging there😊. It isn't exact but gets you pretty darn close. For what it's worth, set the foot end a few inches higher than the head too. It keeps you from...

I have used the calculator and it has worked well before. Even double checked your numbers. It sure does seem your straps are pretty high. Try forming an L with your thumb & index finger. Thumb...