How To Fix Mana On Titan Casters

I love the titan caster archetype.

Its fun, its frech, its mana hungry.

I kinda feel like there are no good ways to solve mana issues aside from going mind over matter mana stacking, which I want to avoid.

Stacking armour/es and block is a very nice way of building a tanky titan, with huge recovery.

However, I cant see a way to solve my mana issues. I am running bonestorm, which consumes 300 mana per second at level 17. Going forward it likely will go up to about 500+.

This is without inspiration. But being forced into inspiration on every main skill feels realy bad too. Also, I dont think inspiration will be enough anyways.

Have not yet incorporated arcane surge, which I will do, but dont expect huge change from.

Any good ideas?

Edit: I do have +10 levels for my bonestorm. The biggest issue I think is the multiplicative mana cost increase with levels