I didn't like how limited head shots were or how hitting it or anywhere else didn't really matter so I came up/stole from an earlier post this.
Hits the the head after armor are then doubled Before TB is taken off.
Ex. Damage=10 TB=4 AP=5 Dmg(10)-AP(5)=5 5x2=10 10-TB(4)= 6. You take 6 points of Damage.
You also take full damage to limbs and torso.
This made the game more lethal, but still gives you a fighting chance when shot in the head.