Quote from Jaetch
I don't know if you're misunderstanding eDPS or something, but if you're only getting 2.5M eDPS out Arcane Torrent with 1.3M sheet DPS, something is wrong. I have a bit over 800K buffed DPS and I'm getting about 14.5M eDPS with straight Cascade cast and Ignite Magic Weapon buff.
Just checked my eDPS as you state it, atm it is:
Dps single target: 20.3mill
Dps single target(Archon): 39.3mill
Spec (Same both times):http://eu.battle.net/d3/en/calculator/wizard#UemOjS!SRTZ!YccZaZ
Only with 1 test, and not 100% precise, but that's my numbers atm :).