Coruscanting Elixir stronger Setup than Searing Purity?

So I have this Crackling Lance ES guardian that has been working really well so far. Pseudo Mageblood with Traitor Keystone 90 to all resists and Nebulis etc. works great with 3 potions. Presence of Chayula and Ivory Tower to reserve Life to ES and lots of Auras and then Coruscating Elixir to handle the Chaos damage.

When I was making the build I thought that dying to Drought Bringer mobs was fair price for such setup and eventual plan was to upgrade to Searing Purity at some point to get rid of Potion limiting weakness. However to my surprise I have died exactly 0 times to Drought Bringers. This mod seems to be extremely rare. I think I have actually spotted it once and even then it died without any problems.

So it feels like that Searing Purity would be bit of a waste since Coruscanting Elixir seems to work just fine and staying with it would allow to get something like DPS ascendancy from Inquisitor. Only thing I think Searing Purity would give benefit that it would work better with actual Mageblood but I don't have one.

Drought bringers are on the rare side of monster mods, but you've probably come across more than you think. They have an aura that can be outranged. So, being a ranged caster, you shouldn't have much problem with them if you keep distance.

My melee flask using character, however, just dies instantly when I come across them.