RE: SHOOTING FROM A TREE STANDING
the only time i think you need to aim differently is on really close shots you want to hit high in the ribs but not too high since the backstraps and thicker part of the ribs can mess up your penitration, you want to get both lungs but if you shoot too low when they are close then your likely to get only one or skim down the side of the deer. other then that i just make sure my form is good which also helps take the focus of the horns coming at you and put it where i want to hit.