Not sure if this has been covered for mac...the whole routing Traktor into Live thing but I found a good tool for Mac callled "Jack". It uses virtual audiop cables and is pretty easy to use, low latency and cpu load meter.
I have just been playing round and got each of the 4 decks in Traktor to run through individual channels in Live. I had seen Ean's write up on it but wasn't sure if it was being done on mac...
http://www.jackosx.com/
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