Rob,
Sometimes at larger events with more traction I find that the car want to do that when turning into hairpins and sweeping corners. I don't think there's really a setup change that will help the car in the area that won't affect the car in the other parts of the track.
Usually, for me, I find just making sure i go into the problem corners a little smoother than usual (be more progressive with the steering, and roll on the throttle rather than blipping it), the car does really well around the whole track.
Are you running on carpet? If you are I could send you a setup base from my most recent event.