I can confirm that Berserking, Unbridled Wrath, and Furious Attacks do not change proc chance per swing with haste rating or Flurry. I found the 95% confidence interval for Berserking to be 0.967-1.017 PPM. Details on my blog.

Could anyone verify the proc chance on [Libram of Defiance]? Everything I am seeing is pointing to a 50% proc rate.

I am comparing this to [Libram of the Eternal Tower] but have not had the emblems to buy it yet and therefore have not been able to test anything.

Many thanks.