Glad I haven't been the only one using that feral build.
Played it for PvP in a while, the burst is absolutely insane. My main complaint is that sometimes you have TF/SR up and MoC procs like crazy, giving me a very nice burst even outside Incarn. On the other hand, a lot of times it simply does not and it is the most painful build ever.
Lately I have been playing with this build:
https://www.wowhead.com/talent-calc/druid/feral/cyIc
And 3 times the Raking Ferocity trait (rake increases the damage of next FB). Very good build to get kills and to train healers as it has a low CD burst (if you can manage your kicks well).