I'm a level 40 DK in heavy armor. Play as an Imperial and have all passives in heavy armor and for Imperial that are available, and then some. In PvE I unfortunately live in a constant state of "overcharged" armor - even in all white armor, with an armor value of somewhere around 13XX (I forget the exact amount, but it's above 1300). My weapon damage is somewhere below 100 in PvE.
Now, in PvP my weapon damage scales nicely UP to 126, BUT my armor scales DOWN to exactly 867 - i.e. less than PvE at level 40. Can someone pls explain why?