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Congrats on your Heroic Kill for that toon.
65 mastery to gloves will be of more benefit to you.
Your ISF time needs some improvement, only 89% for a complete standstill fight. Make sure you're using some sort of buff tracker to monitor this buff, that way you know better when to start hardcasting a new SF, it's usually between 2-4s left of the buff based on haste% and travel time. And your DI target, the mage, was very mean to you and didn't give you much DI uptime
Try to see if he can improve, or toss it on the resto druid or another dps that can give better stack uptime. There's a few lists around in here and on EJ for DI targets and raid gain.
Dot uptime was pretty great, but as always there's room for improvement. Corruption was technically the lowest, but only at 95%. Just make sure you're not overclipping BoD. BoD is only clipped when Buffs present > Previous buffs when cast. When in doubt, don't clip. Could have also squeezed in a couple more shadowflames, make sure you're doing that on CD as best as you can.
Remember that DS:Imp only affects cast time spells, so while this does include the initial tick of immolate (and only the initial hit, not the dot itself), you're wasting a couple seconds of DS:Imp casting your other two dots and conflag if you pop DS:Imp before you start dotting. I usually recommend waiting till after you conflag, it'll give you at least one extra buffed incinerate. But still pop bloodfury before dotting.
Also, when under backdraft, use those stacks for Incinerate, not Chaos bolt. So it should be conflag > incinx3 > chaos bolt (assuming you don't need to hit any other spells/CDs)
Also make sure you're popping your doomguard at the The optimal time to pop the doom guard for most fights is during the opener, when you have as many procs proccing (power torrent, lightweave, WoU stacks) while your pre-pot is still active. What you ended up doing was popping Doomguard about 2s after Power Torrent faded, so you missed out on when you had PT/Lightweave up AND 10 WoU stacks. What I end up doing, is I have a weak aura setup to show my PT/Lightweave procs, and when both are procced it shows my doomguard is ready (if not on CD), timers under lightweave/PT for time left on them, and a stack counter on the doomguard icon for WoU stacks. Basically once I see the doomguard icon pop up, I wait till either lightweave or PT are about to run out before popping, to get as many WoU stacks as I can. Or if I already have 10 and the icon shows with both buffs up, I go ahead and pop it. It's basically a visual "Hey this spell will be extra awesome if you pop it about now" thing.