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If you have no numbers, why are you posting? We don't care about your gut feeling.
This is very much the case. I've broken 10k numerous times but they have mostly been with 3 or more Storm Power buffs. I usually average in the mid 9k with just 2.
I did around 11k on <2min 10man Hodir kill in early May with 1 minute of Storm Power uptime.
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Is Rake even worth refreshing while Storm Power is up? I'd assume its value diminishes greatly because outside the initial hit it cannot crit.
I have no hard numbers, but I would vote that it is worth it in no small part due to CC procs from T8 2 piece set bonus.