FOZ: As i told, i'm using EDU with 12 armor levels. Developers had just 6. that would mean PB levels are not hardcoded,so how do you explain that they actually work?

About your test: Longbow has AP arrow, that means only half of armor counts, so 3.5+6 vs 1.5+6 is not that big difference, especially if 40% hits are ignored.

To test it correctly you need to remove all special abilities as AP bonus, because they a re creating a lot of confusions.