This seems like a solution in search of a problem. Tanks aren't there for DPS so anyone focusing on that is just missing the point. Fights are so dynamic that the tank who does more DPS tends to be the one not moving around or changing targets as much. Mitigation Vs AoE seems spot on as well. War has a slight edge in AoE threat, and Pld have a slight edge in mitigation. What exactly is the problem here? They are very balanced and both are useful. This sounds like you're simply trying to make them identical in effect. That would be boring.