Frank,
No argument on the 160 snuffer causing damage. As I mentioned earlier, for my son and his closer to marginal set-up, I want all the things I can get in his favor to get a two hole wound (no bottom exit from a treestand can make for a tough to non-existant blood trail). This includes skinny carbon arrows, high performance 6 strand 450+ bow string, perfect arrow flight, 12 grain per pound arrow weight, whisper quiet bow and of course a two blade narrow Zwickey Eskimo's with back sharpened blades . His shot angle based on his 15 yard range limit is going to make for a thicker body cavity section to get through than if he were broadside on the ground.
I personally use a 3 blade Razorcap and it's an outstanding head and great for blood trails and creating havoc. However, I want to make sure that my sons arrow penetrates both lungs at a minimum, even if hitting a rib bone. Thus a narrow two blade head and the other items mentioned above are the recipe of choice for his set-up.