Divine flesh/ MOM ES still taking dammage

Every time you use Frostblink, it costs mana. Every time Arcanist Brand triggers its linked spell(s), it costs mana. Since you're running Eldritch Battery, all of those costs are paid in ES first.

If you've got even 1 Brand active and triggering somewhere, you're losing ES every time it does. Even if you're hiding in a corner somewhere doing nothing and not taking actual damage.

will try with every gem out

thx aggromagnet on slow regen maps it was killing me did not realize it costs mana on every proc not just the cast

Yep, gotta pay the mana cost for triggered spells in most cases ever since 3.15.