Originally Posted by
Garotte14
All the math seems fine, but you're missing something that no one has considered. The argument is, "If you get a fast umbral tick, is it worth it to cast Thunder?"
Well, if you are playing correctly, after you cast Blizzard III, you should have already qued your next cast. So technically, no matter which way you spin it, you should be casting Thunder or Blizzard. Otherwise, you are delaying a cast to see if you get a fast umbral tick. Delaying casting, even slightly will always be a DPS decrease.
The alternative would be to always que Blizzard IV after Blizzard III, but what if you don't get the tick? Casting Thunder at this point is risking Enochian and Fire IVs.