you pass 300 DPS the moment you land your first punch, your opening rotation determines what your starting burst is at, be it 400, 500, 600 dps, then your rotation determines how much it decreases until it levels out, be it 400, 300, or 200 DPS, you don't start at zero and work your way UP to 300, you start out well above it, and try not to dip below it.