you are doing something seriously wrong
dps is never going to be low by just spamming Arcane Explosion and Arcane Blast.
And when Arcane Power is up you should destroy.
Dont even need Arcane Orb and all that other garbage.
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mana on trash is rarely ever a problem even in +10 fortified teeming week I only once had a mana issue because I wasted Evo.
Even in those rare circumstances I can still greater invis and drink and because Arcane AOE dmg is pretty sick remain on top of the damage meter while my group finishes off the last stragglers.
Arcane is fine, the only thing Frost really has over Arcane is slow utility. Arcane can keep up with Frost on AOE and is better on ST.
I played all my keys with a Frost Mage while I was Arcane. I beat him on almost every pull and while I had a couple more Ilvl he had much better trinkets.
Also I feel like my gear is not in a good place for M+ right now because I have too much haste, not enough crit.