DRK and WAR I would make only a few changes. DRK more so than WAR to buff its usability as OT and defensive abilities slightly.

PLD would need more changes, which I won't bother listing here (none of which are difficult). The reason isn't that PLD is so weak or anything (you could fix that by just increasing potencies or whatever), but because of how the job works at level 50 and how all three jobs work at level 60. If, for example, you want to balance hate and also have people be able to keep Halone up as a debuff at level 60 as OT, a way to manage hate will probably start being necessary or it'll force other tanks to use hate combos or turn on the tank stance, sacrificing potency or the other tank's debuff and forcing PLD out of the OT role, etc.