Just a quick glance at his logs, over all your attempts his shuffle uptime is 44% but the Grace of Air uptime is 84%. You can look at the GoA buff as his uptime throughout the fight since its up 100% of the time you're alive. His Elusive Brew uptime is 88% which means that your shaman died when he was alive. If you look at his highest uptime buff (EB @ 88%) as his active time then his Shuffle is up 50% of his active time.
I'm not sure how he's made it to H Garrosh with only keeping this up 50% of the time as that should have reared its ugly head much earlier.
Even his Tiger Power uptime is 73% which means he's prioritizing that over keeping shuffle up.
This is poor play and I'm shocked its just coming out now at H Garrosh.