Just took a look at the new nightfall skills for rangers and found this:
Rampage as one: for XX seconds you and your animal companion move 25% faster and attack 33% faster.
It has 25E cost and 20R so not sure if you could use it all the time etc, but this will be a very good skill to use on bunny thumpers, and also frees up the tigers fury slot for disrupting lunge

Example:
Rampage as one
Hammer Bash
Crushing Blow
Irresisteble Blow
Disrupting Lunge
Comfort Animal
Charm Animal
Res sig