Also would say to pay attention to the timing. If you know the damage potential of limit break and when to use it and a melee for instance is not casting it, then i would say go on ahead and use it
Ifrit Hm for sure is more of a must to have blm lb the nail phase, as 3 bars can wipe all of them or close to it and melee lb would be well, pointless.
I do hope in future updates that we get better use for caster lb, perhaps even with the "buff" we are to be getting