I range the horizontal distance to trees by aiming the rangefinder at the trunk at the level from which I am hunting. Or, just range the LOS and subtract a couple yards.

Point of impact will always be high (upslope or downslope) - this is counter intuitive. The difference in point of impact occurs because of the difference in angle between arrow's travel path and gravity. Gravity always acts directly downward which is 90 degrees or perpendicular to the arrow's path on flat ground. When shooting uphill/downhill this angle is less and gravity's effect is reduced. The effect is not pronounced enough to worry about inmostpopularbowhunting.

Fora practical example, take a light fishing rod with a heavy sinker tied to the end. Hold it perpendicular to the ground and it will bend. Hold it uphill or downhill and it will bend less.

Faster arrows spend less time in the air before impact therefore gravity has less time to accelerate the arrow in a downward direction. Wind resistance slows the arrow and allows gravity more opportunity to pull arrow downward.

Bottom line: I think we have debated this before...