This works very well, but there are a few additional things you can do while building for the Cleaves. If you're at 4 stacks, you can actually Holmgang -> Berserk -> Full Swing -> Internal Release -> Mythril Tempest -> Cleave -> Infuriate -> Cleave.

This ensures they're stunned for both cleaves and prevents anyone nearby from CCing you. Of course this particular burst rotation isn't going to be available all the time, but when it's there, it's viable.