If you're willing to start/end your trip in YVR business class to JNB on your dates is $3309 on KLM/AF (YVR-AMS-JNB-CDG-YVR).
And the OP would earn $8k mqd on that flight vs $5k mqd on the DL $6k fare. On the Virgin flight, OP would earn closer to $9k MQD.