Vengeance (Request/Suggestion)

Greetings! I've not had the pleasure of playing WAR during the later levels/content yet, but I can do simple math, and understand how player damage based mitigation vs enemy damage based mitigation works.

WAR needs a defensive ability that scales with ENEMY damage, rather than player damage, something analogous to Rampart or Sentinel. MRD/WAR are supposed to be a tank job, however, the lions share of their abilities are offense focused, with a hand full of recovery abilities thrown in as an after thought (Personal opinion).

This is not the only thing the job needs IMO, and I don't think a single ability change will fix the job as a whole, but it would be a start, and something to think about for further adjustments.
So here is my request/suggestion:

Original Ability:
Vengeance
Cast: Instant
Recast: 120 sec
Delivers an attack with a potency of 50 every time you suffer physical damage.
Duration: 15 sec


Revamped Ability:
Vengeance
Cast: Instant
Recast: 120 sec
Steals 20% of damage taken back from attacker.
Duration: 15 sec

Obviously, if you get 1 shot, you can't recover the 20%, so this is not exactly the same as 20% mitigation, and it only works for physical damage, unlike PLD abilities.

Please like this post if this seems reasonable and worthwhile!

Please like this post if you would rather Vengeance remain as is!