Just put an equivalent amount of MND onto Tank armor as the armor already has VIT. Then PLD's healing will actually be useful. Won't be a main healer or step on their toes, since it's just cure 1, with no divine seal, or maim and mend, but it'd be worth casting if they could heal themselves 1000 or so hp at a time.

And a PLD version of overpower. I don't even care if it's exactly the same ability with a new title. (I'd suggest circle blade.) Or just put Circle of Scorn on the global cooldown. Right now any time there's any AoE's flying, the BRDs and BLM are tanking whatever the PLD isn't actively hitting.

Give NIN a trait that makes Perfect Dodge block the next 2 physical attacks a la Manawall. Let the normal 1 hit Perfect dodge be cross classed by all tank jobs. It's cross class-able by all classes and no jobs right now, that's just silly.