The main problem with high GR is not really survivability, but damage. U can get around survivability but the lack of damage is what's gonna make u fail. Even if u have all your monks with Blackthorne's sets and Xephirian amulets, if u don't deal enough DPS, it's a lost battle. Not to mention there's a complete lack of balance in GR. Your gear and skill is prolly less than 50% of the chance to succeed a GR. More than 50% is going to be RNG. It's all about the map and the mobs u get. Blizzard REALLY needs to address this ASAP.
Nice video, but from there I can see the killing speed is not good. AoE is not the best like I thought. Sure u can pull stuff with Cyclone, but u should see what happens when 4 DHs place sentries, or even better, when Wizards cast Apocalypse and just run while everything dies off screen. Still, it's fun and will prolly try later on. The dsync is a serious problem. Sure Crippling Wave hits 360 degrees, but that's not the best skill for the SWK build.