Might try to get a zunimassa set...and get rid of pierce the veil.
Thanks to not using pierce, and having the full zunimassa set... I don't really run into any significant mana issues. I basically unload bears until I'm out of mana (which takes quite a while) then switch to darts, where I have a couple boosts that make them a pretty effective alternative. With the time it takes to go grab a globe or something my mana will be fully regen'd.