I havn't had a arrow not pass through in years of hunting. In the last 20 or so years. I have bowhunted for over 40 years, I have had a two shoulder hits one was a 300 + buck and the arrow still pass through and stuck in the ground, making a X in the paddle bone. I do think it how it hits the paddle bone makes a difference. Maybe it's because I have always shot 65 to 70 Lb bows and carbon arrows. I just shot a doe on my first tag at 25 yards this year and the arrow passed through like it didn't hit any thing and stuck in the ground, but made that great sound a pass through makes, both lungs and went about 20 to 25 yards and it was dead. your right about vanes , but feather will lay down on the shaft when wet with blood. Vanes do take some penetration from your arrow. but with are bows we have now days and the carbon arrow it's not a problem

Put them down