Have to understand that helixes are a completely different animal though--thier main use is the DoT factor, which may run 15 rounds at 99 (possibly longer?). Though they receive bonuses from INT/MAB and get day/weather bonus/penalties like direct damage elemental spells....their main benefit is their DoT factor.

Let's take the given example of 150 damage with say Ionohelix. That's potentially upwards of 2250 damage (150 X 15) for just 26 MP. Compare that to the cost of a BLM's spells capable of such output. Even if it's on for a shorter duration, like say 9 rounds, that's still 1350 damage for just 26 MP--with very low enmity pull by comparison.

Thus, they are already VASTLY more efficient than a BLM's nukes (when the mob survives the full duration of the spell, that is)--and still will be after these adjustments.

Bear in mind also, Helixes are spells that are learned below level 50 (as in available with subjob)...not something that had to be meritted at 75 or otherwise learned around 70 or higher. Just further stresses the need to enhance direct damage elemental magic--the alternative could be for SE to focus on balancing things by nerfing Helixes. We don't want that, now do we?