My point of impact doesn' t change unless the target is directly under me. I spent alot of time perfecting form before I got target panic and I always keep the upper part of my body the same, no matter what the shot. With a good harness, you can dang near walk up the tree and stand horizontally.
Now, if the target is directly below me, I use my 30 yard pin, instead of 20 yard (I don' t have a 10 yard pin). Reason is, using my 30 yard pin causes me to move the arrow more in line with the target. The distance between the arrow, and the sight.
Good luck and practice, practice, practice.