Gonna start useing carp tips and fiberglass arrows to get better pass throughs?
Bow fishing is a bit different...you are now fighting gravity as much as penetration. (Most arrows float)
Granted, deer are not made of foam....but penetration is penetration. you can' t change 3-4 things in a test and hope to come up with solid answers.
The tests simply show, that in a constant media...momentum is not as effective at estimating penetration as KE is.
Now, if you can get me 20-30 identical twin deer...that have all eaten the same, and are in every way imaginable identical...and we can put arrows in the exact same spot on each one when they are all holding the same amount of air in their lungs...and the last one isn' t too freaked out after seeing the first 19-29 of his brothers getting shot...THEN we can test it YOUR way...until then we are limited to synthetic matterial that is easy to make consistant to do scientific tests.