Fast Blade --> Savage Blade --> Rage of Halone has an average combo potency of 203.

Berserk disables your skills for 5s.
8 attacks every 90s with 50% more potency, equivelent to 12 unbuffed attacks. And then subtract 2 attacks every 90s because of pacification. In other words, its a 5.5% buff to DPS.