Physiology front and center.
Here's the deal. In no way can you control, nor figure out, nor assess the blood trail quality on any shot.
Ever, never, and you never will. So OCD and control freaks, hang on man!!!!
Your critters are literally made of layers, skin, fat, meat on top of ribs, then ribs, the intracostal space between the ribs is actually two layers working in opposite directions so the animals and humans can Inhale and Exhale. Literally a set of bellows. There's some of the little layers of internal "silver skin" inside the ribs..you know, you rip it off when you BBQ (on pigs anyway)
Oh man, then....bones rarely break out of the way, they get cut and pop back into place, covered by layers, etc.
Interally, if you hit a major artery or cut the top of the aorta off, center punch the heart, etc. the blood pressure is maximum. It can get crazy, but not always because the layers might plug it up.
However, with a bilateral pneumothorax, "double lung" shot, lung collapse is the primary phsyiological factor resulting in death. These shots are usually mid body and they go down before they get to bleed a lot.
What we all need to do is kill the animals fast. That sounds like I am being a typewritter hammer head. I get it.
LAND THE PLANE YOU FAIRY!!!
What we are seeing in RF testing on big feral hogs, with some crazy layers plus crazy hair and mud, the performance of very high integrity blades, iron will is one, the Magnus Ser Razor and Buzzcut have done fantastic and then the much more durable monolithic heads, VPA and single bevels, sharpened and honed to "shave your face sharp" retain their edge AFTER PENTRATION of the impact side thoracic wall. Huge reason for short "animal locations".
We are also seeing the animals reaction to impact significantly reduced with cut on contact heads, this helps if the layers plug the hole. They just don't go very far. It's like it doesn't hurt as much or pop or something. Silly animals haven't explained it to me.
So, shoot them in the vital V, straight up the leg, lower 1/3 with an adult arrow and super sharp high integrity heads walk 40 yards to pick them up.
It's way easier. If you read the comments on the IW, you'll see these things blended in.
Late!