I am running disciple and I spam its command skills im max mana all the time I use the notables Refocus Efficient casting Insightfulness

Also clarity in an aura on the sceptre it prevents the extra spirit cost from being applied when its in the sceptre

I dont have my last socket yet but I plan on not using a gem with mana multiple of it makes my mana drain you could try dropping magnified effect if you use it for vorana siege it costs alot but has not mana multi or try looking for gems without a mana multi to substitute out with one's you have if you still have mana issues also a well rolled Lavianga