I'm currently leveling a Priest in full Heirlooms and I've noticed, even if the other players in full Heirlooms in dungeons that I am always top DPS.
This has been the case from level 15 up until level 50 (I'm level 50 now)
Has there been a major damage increase so they can compete with Mistweaver DPS or is just bad scaling for low level like Ambush Rogues in PVP?