I've never had agro issues even with keeping up storm's path... Although usually if I'm starting a fight or taunting off the pld I'll follow it up with Unchained+Berserk+Internal Release and unleash everything to ensure a massive threat lead for the OT to also go all out without pulling threat off me.

If you still have issues with threat with proper offensive CD usage well then you've got a lot to improve on as a tank.