Build questions

If a character with more armour than another one receives a blow while actively blocking, will he receive the same amount of stun on the heavy stun bar or will he receive less?

Regarding effects like the trampletoe boots, if I attack an enemy while dual wielding 2 maces, will the overkill damage be calculated based on the damage of both weapons together, or only one of the two weapons?

What would increase the damage of my character the most, slapping a 100 - 150 fire damage on my 1 hand mace or slapping a 20 % extra damage as fire on it?

Thanks in advance