VIT and STR accessories

[Zaft]

snip

You're misusing the term mitigation. Mitigation means a decrease of damage taken, not "how much HP is left afterwards". VIT does not decrease any damage, it simply increases your HP.

Strength increases your mitigation by increasing the amount of damage reduced when you block or parry.
Parry increases your mitigation by increasing the rate at which you parry attacks.
Skill Speed increases a WARs mitigation by increasing how quickly they can re-up Inner Beast.