PvP input/interrupt/order

[Kataz]

The only way I manage to survive and counter the melee LB as Ninja is with some VIT accessories / some VIT attributes / PvP VIT attributes

That does seem to be all you can do, but SE has done a pretty good job of making VIT accessories pretty unappealing to non-tanks. For BLM at least, the Law 180 tank earrings seem like a legit choice, the 190 tank Gordian neck has parry and crit, hard to justify but I'm giving it a go. Also using the 180 tank PvP wrist, crit and skill speed, very hard to justify, but none of the tank rings have any caster appealing stats on them.