Maybe I misunderstand something, but the clearing speed seems rather low even though the mobility is great. Also, maybe I am imagining things, but there seems to be a CD on arcane orbit procs. which slows things down a bit.
I see your reasons for not using mirror images, but I think MI > slow time on higher difficulties. My experience with slow time says that it will get you killed if you use it on Electrified champs. MI also doubles as an additional stun breaker (jailers/frozen).
How do you deal with continuous non spike damage (plagued/molten/arcane enchanted/electrified/fire chains) that does not proc illusionist? Maybe consider using 4 piece Blackthorne?
Additional recommended gear for this build could probably be wand of woh and moonlight ward.