As Rob has stated.....bend at the waist for the same point of impact out of a stand. Also, practice out of a stand.

As far as taking both lungs out of the equasion....30' up a tree(which is pretty darn high)and a 10 yard shot, results in a 45 degree angle. Getting both lungs in this situation is still an easy task. Now if the deer gets in alot closer than ten yards, it obviously reduces the chance of getting both lungs.

That is why I try to set my stands so that I can expect a shot opportunity somewhere between 10-20 yards.

Of course, sometimes those deer just don`t play by the rules!