It would be worth checking whether or not Stormsouls still beat 3 MAB rings, as total AGI has greatly increased post-ilvl while MAB has not gone up nearly as much for RNG. Path C Qaaxo Leggings should be best for that slot.
3 MAB rings may edge stormsoul, but good luck getting them.
I've been trying since Abyssea debuted to get +3 MAB rings. I'm still at +2s. I've probably gone through 1000.
Edit: For perspective and to illuminate that number isn't pulled out of my ***, I've cleaved three Tahrongi weapons and it used to be my exp zone of choice for cleaving just for the sake of trying to get rings.
No luck.