Guys, i will post my tests soon. My point is: Unit with armor 0 will take much higher looses than unit with armor 1. its because any attack value will overmatch armor 0 by extreme margin in mathematical formula. It is not that big margin against armor 1 or 2 or3 etc... Simple mathematic.
All you need to test, how resistant will be unit with armor 1 leather in comparation to armor 4 leather.