Well, it's very inconclusive so far. I had a windfury shaman follow me all night for netherspite/nightbane and then 2 heroics. At times I would have higher than normal damage, and at times lower than normal damage. I did notice that I seemed to have a bit more rage on average than I used to have.
I think it may indeed be better, but I definitely need to try it for a few days to be sure. I also have a lot more +hit than your tests had, but I'm not sure if that would impact results positively or negatively.