This is my usual Build for Loath, hope it helps.
I too use Furious but its Rare when I start attacking myself for the speedy meter progression. I instead go in hard and close of enemy paths with The Cookie as it continuously explodes. I encourage getting shot while using Improved healing to keep you in the fight for longer.
You can use Obstinate which is good too but I always preferred Furious over it. Also I don't recommend chasing enemies who are running away from your beast form when theirs easy access for them to climb and drop from tall platforms as its a waste of time. And if your doing Antagonist mode, don't be afraid of using his self destructive blast at the end to deal last minute damage.