A new tank stance to fit Dark Knight better

[Reynhart]

I've posted this idea on another topic, but I think its interesting enough to not be lost upon several others ideas :

I'd like to see Grit changed to be more unique and fit DRK lore.
After all "Shield Oath" is pretty logic. Paladins focus on their shield to reduce damage. "Defiance" ? Sheer HP, pretty much the thing of WAR too.
Why should "Grit" reduce damage taken ?

For me Grit should be closer to "Dread Spikes". Yes, I know "this is not FFXI", I'm frequently one to remind others of this fact, but look at our skills. Leech HP this, leech MP that, etc...
So a Dread Spikes effect that would retaliate 20% of damage taken and heal you for that amount. Basically, as long as you're not one shotted, you only suffer 80% of the damage. Roughly the same as other tanks, but with a unique feel to it.

With that, DRK's potency should be lowered. Yes, you read that right, decreasing DRK's potency. Why ? Because retaliating 20% will allow him to "burst" on every tankbuster. Seeing recent numbers, keep in mind that any tank can do hits that surpass 20% of their HP every minute or so. Of course, mitigating damage will reduce damage taken (duh) thus reducing retaliation.

This would bring a unique meta to DRK : "Ok, I'm full HP, I have Stoneskin and Adloquium, I can take this hit without a cooldown"
Or "I'm passed the HP threshold, should I pack more vitality to need less mitigation and retaliate more, or should I pack strength to do more damage by myself ?"

Except the 20% retaliation on damage, I'm not throwing any new numbers because it would require a lot of calculation to be balanced.

I know there's a little chance to see a core mechanic of DRK being changed, but, maybe if enough people love it, it can get some attention