Quelling is a crutch for bad tanks, Pure and simple. Not even a fresh 50 Tank has any excuse outside of you getting a lot of crits. But I say this as someone whose only tanked as a WAR and they have a TON of aggro. Maybe PLD has it harder, Someone can probably weigh in on this.
Eye for an Eye isn't great, But its also not something you should really do without, If it procs its pretty damn good.
That other xclass which must not be named doesn't do anything worth mentioning.
Ruin or Truth of the X is clearly the best use of your last xclass slot, Since you don't need quelling or that other Bard thing.