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If I were you, I'd look into using iperf to generate traffic (http://dast.nlanr.net/Projects/Iperf/). It's much more reliable and provides real test measurements. WAN killer is good for quick and simple traffic generation, but as you said, it's not so great at huge traffic volumes.
To generate high amounts of traffic, you can run multiples copies of WAN Killer either on the same machine or from multiple machines.