I'm having a pretty fun time with the monks. I changed my spec up again a bit.

I think having 1 of the monks with EP and this weapon is key: http://us.battle.net/d3/en/profile/K.../hero/57397766
I just switched this a couple hours ago.

I'm also using different EP ruins on my guys, I'm not so sure the same ruins stack. When I made the switch to each using a different ruin, it seemed to make a big difference. But I really don't know for sure.

I did make it up to a GR 24 but I just died too much. Didn't make the timer.