The 10% of my dps being WW is not a guestimate. It is a trend I've seen from recap and WWS and has been confirmed by other people's posting of DPS log analysis. While I may not have hit it right on the money every time it was up the difference wouldn't have been all that much given the huge percentage of our dmg is just plain white hits. I'd guess in trash fights it comes closer to 15-17% of overall dps. But for bosses you lose a lot of potential WW time to executes and other variables. Here's a gruul's example with post-patch WW (so half the number to get the times I hit it I guess).
Horgar - WWS
Fight was about 6 min - Ideally giving 36 uses. I used WW 23 times. Now we have to subtract the start seconds where tanks were getting aggro, then subtract shatter time, and also subtract execute time before figuring the real amount of time I had to use WW effectively and then divide by cooldown.
For arguments sake lets say I could have done the same damage but WW was 15% of my total because I used it 36 times. My avg ww should have hit for around 808 including both weapons so I add 10k dmg to its total and now 33k/218k is about 15%. The variance would still be around 41. 41/808 = 5% *.15 (15% of overall) puts us at about 0.7% of overall dmg. Right about at my estimate even when figuring it's 10% of the overall dps. So I can do about 0.5% - 0.7% more dps if I use a slower off hand (assuming I have the rage to use WW every time which is less likely at lower gear levels when using 2 slows).
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