Make sure your highest elemental damage is Lightning - just because you have it, doesn't mean it's the highest out of all of them. With the exception of Meteor - which is there because of the Tal Rasha bonus.
Make sure your attack speed is high - i think around 2.0 unbuffed (a little less isn't a problem). Then with Gogok stacks, it'll add 15%. And then with Archon stacks. Mind you it's relatively harder the first time you go into Archon, once the stacks double up, you'll see a huge difference. With all the buffs and stacks, you should be hitting 5.0 attacks/sec.