I have seen a couple of cases where shooters with very heavy arrows did not get good penetration and and neither one has never had a pass through. It has nothing to do with the weight of the arrow in those cases, it is arrow flight. They do a lot of stretching when finding their draw lengths and tuning, but they fail to do that same stretching when actually shooting from a tree stand and as a result are shooting grossly over spined carbon arrows. I prefer to shoot ten grains per pound at my less than 27' draw, one of the last deer was shot with a 9 grain per pound arrow, broken rib pass through, the arrow went into some snow covered weeds and could not be found. In some cases a flatter flying arrow is an advantage. A straight flying arrow at the hunting draw length and a broadhead that will penetrate properly with a lighter arrow can make up for loss of arrow weight, with the added benefit of a flatter trajectory. As a still hunter and ground sitter with a less than 27" longbow draw, my shots tend to be longer than most tree stand hunters. Many people seem to short draw a little from tree stands when shooting down at deer, with any arrow tuning, I would take that into consideration.