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Make sure you have all four elements active when in Archon Form - you'll get a huge boost from the Tal Rasha set.
Try changing Magic Missile to Blizzard Frozen. Yes, both are 'cold' but you might do better with Blizzard.
It's usually the second time, if not the third time you go into Archon - with the overlap of stacks from The Swami - that you'll get a huge boost from the Vyr set.
As you stated, you have lightning on your bracers - which is great. Just make sure that's the highest elemental damage you have - as that is what the element you'll be using when in Archon form. If it isn't it won't proc Manald Heal.
Yes, you'll feel like you're doing massive damage with arcane torrent - however, this will only last as long as The Swami is active... once that drops, your damage will go back to default damage power.
Tal Rasha ELEMENTS... reread the 6 piece set bonus. So pretty much while out of archon - Arcane Torrent is Lightning, Blizzard is Cold and Teleport is Arcane. When you have all three - you pop Archon which is Fire for the 4th element. So those are the 4 elements used to proc the Tal Rasha 6 piece set bonus.
That bonus is active for the first 8 seconds in Archon (you can see the Tal Rasha element in the bar when it is active).