When I'm taking panning shots I usually leave IS off when under bright day light. When it gets darker or I want more blur than usual I'll turn IS on, but I set it to only stabilize up/down movement.
And on top of that it's mainly a lot of practice that helps. I think it was the third race I attended that I started getting pictures I really liked.
As sunnykalsi said, a monopod really helps and eliminates the need for IS.
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