Poise is needed on heavy armor to make up for the sidestep dodge (very short distance) and stam hit because of its weight even with encumber stats. Currently the sidestep is not even close to the distance a pike can hit you from once you sidestep. Heavy armor should give a kinetic defense given that it is HEAVY ARMOR.
As it stands now the dmg reduction does not prevent as much dmg as simply dodging and with the stam builds out there with lighter armor and pike the value of heavy armor without poise (knockback, knockdown, stagger protection) is severely limited. Lighter armor players can simply dance around you (I have killed many heavies this way) and kill you on stam/dodge distance advantage alone and this advantage extends beyond broken when a pike/spear is used.
Allow Heavy bulids to be viable again by re-adding back poise to heavy armor.