I personnally agree with spooky. When i open as MT i still use the unchained berserk openning. In my experience it's way too risky if you don't. Then you swap deliverance for a FC instead of IB at the end of the opener.
Usually i open with tomahawk-> unchained -> HS-> Brutal-> Maim -> Berserker-> eye-> etc. And my agro is steady.

In A3S i'm still using IB sometimes because our overall dps is better if i use IB+Equilibrium at the end of my opener, thus giving extra time for healer to dps like crazy.
But that's more like a feeling and i chose between IB or FC depending on the amount of damage i took, how many crit i got, did i have a crit adlo at the start and so on.