Blood Mage and ES

I'm trying a hybrid chaos build with Blood mage that I'm really enjoying. The damage isn't 1-shotting everything, but when offerings are going, and contagion speads to 400%, rares and magic mobs vanish. However, there's a glaring problem with blood mage...

When you cast, it takes your life and stops your ES from recharging...

This is so dumb. The damage between your own casts and enemies should be differentiated. Please fix this. It makes it to where ES is useless almost entirely as a blood mage.

Blood Mage as a class is broken and not finalized, do not waste your time that would start it, on it play at the moment only two builds, str stack and dd. To make leech work you need a lot of HP, at least 3000+ to cover the cost of the spell.