6704 has famously small buffers (16MB). I don't believe with that speeds you can even accomodate buffering/shaping at that level. Better option would be to go with 6708 (200MB of buffers), which would give more space for the card to handle different scheduling/policing requirements on the traffic flowing through. The other option is to move some of the heavy-hitters to RSP ports or other line cards, to distribute traffic stress if using QoS.
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