On a side note, I want to ask about using berserk optimally. Of course we should take note of mechanics/phases where we can't hug the boss 20s straight, but suppose there's no such mechanic when berserk is off cd, should I immediately use it before my next gcd, or wait for 4 stacks and heavy swing for triple cleave berserk?

For example in sephirot ex p1 with my stats I'd be at 4 stacks when berserk is like on 7s cd, so I either do another eye rotation and waste 2 stacks or do a fell cleave and build stacks again (which I guess would be a big dps loss since that's like holding berserk for 10-15s).