Your crit on chaos strike is 32.7%, that's very low.
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https://www.warcraftlogs.com/reports...false%24162264
Your guild hero'd at 30%, guild should probably hero at 100% due to better uptime on everyone's DPS, 1x bres should be saved for 30% since it's very likely for a tank to die.
As a result, your meta and hero did not sync.
Chaos Blades not synced with meta nor fury.
http://www.checkmywow.com/reports/N1...p/147821045/62
Missed glaive and fury casts, but this is forgivable due to Ursoc fight.
Casts during momentum needs work.
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Fel Barrage is unnecessary for MC. FR Eye Beam is more than enough.
CS crit is above average.
Whilst staying alive in Heart of the Swarm is important, you can also DPS in this phase.
You used your 2min trinket twice in a 7minute fight.
You missed a ton of casts: http://www.checkmywow.com/reports/JD...Pg/144018186/9
Casts during Momentum is good.