The fastest way would be to copy your character over to the PTR. From my experience UE won't get it done live. If you fish hundreds of grifts, you might get lucky with a perfect zombie rift. But the balancing between toughness and DPS is off. You either can't kill fast enough or you die too often. I just made a Monk during S4. After 2 weeks he was a clearing 60. I am still trying to clear 58 with my DH.