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Well, even when the "hidden" cooldown is up, it will still need to proc.
Well, yes and no.
It really boils down to what weapons (speed/High base dmg particular) your DWing. IF your from the "2 slow weapons(something with a speed as close to, if not 3 sec delay)" point of view, then ya....WF on both hands is "ok", since a proc on either MH or OH, should result in a high spike WF proc.
If your from the "Slow MH, fast OH" train of thought, then no...WF on the OH would be a bad idea. Since WF's hidden CD is universal now, a proc on with WF on a fast OH weapon will be lower dmg than if it proc'd on the MH, it will have chewed the chance that the MH "could" have proc'd WF, and thus the main hands chance to proc will now have to wait at LEAST another 3 sec, to just have a CHANCE to proc.
With this understanding, for ppl that prefer this Fast/Slow combo, a FT or RB would be better, since it doesn't give the OH a chance to steal the MH's WF proc, not to mention that since fast weapons are more suited to DoT type dmg, a buff that adds consistant dmg, yields better results on fast weapons (something thats apx delay of 2 or faster).