There certainly are differences between hunting from the ground and from an elevated stand.
There is no need to move you pins. The target distance should still be measured horizontally. The additional shot distance as measured diagonally will be compensated by gravity.
The arrow path through the target will be diagonal which can lead to a lower exit.
I agree bending at your waist as opposed to lowering only your arms and shoulders is very important. This keeps your upper body straight.
When I moved from ground hunting to stand hunting my deer sightings (other than their a$$es running away) and my harvest rate both increased significantly.