Terribah just needs a better reload animation when activating ravenous beast. It takes 15 years right now. Could also have a trade off - while you have ravenous beast ready to go, you get extra stability and range. Once you proc it, you loose it.. if you get me.
That ramp up for progress of Ravenous Beast honestly sounds like a great idea for the perk, much like how Vex's catalyst works for it currently with the stability buff per overcharge stored. And you're right, Tarrabah's Ravenous Beast activation should probably be a simple flick of the switch like Borealis and Hard Light are, not a full high impact smg's reload that takes forever.