Yes, the mangle bug is back. I have an 863 tick here:
Vykromod - WWS
Brutal Impact is actually quite nice, even in PVE. I wouldn't really want to ditch it just for Feral Aggression. According to current mob theories of attack power (as mentioned in a previous post), putting points above 3 is pointless, and 3 just gives you a debuff very marginally better than Shout and one that you won't always be putting up unless you're willing to shift into Bear while DPSing. The Ferocious Bite part of it doesn't exactly inspire either, it might raise the energy at which it's worthwhile to Ferocious Bite by a few points. I may look at the math for it at some point today, time permitting.