BLM should have another counter that only maintains if you keep your lightning buff up consecutively for three full cycles of duration, and when it procs it gives you an instant Lightning spell with a tripled potency double the length debuff. While we're at it give them Fire Hearts that make Umbral spells instant cast from Astral mode, give them Astral Fire-like damage increases, and makes them instantly refill your mana by a set amount per spellcast. In return make it so Blizzard 4 and Fire 4 only award one Heart per cast, and Umbral Ice only gives 1-ice passive mana regen without casting spells. Also give both modes extended individual timers, but they also tick down in the other mode, and if you drop off one you need to hit reduced-CD enochian to start it again.