[Hawkeye]

You must change your settings from standard. I agree with Loosenut, and would also recommend adding a couple clicks of rebound to both ends, maybe even one or two more in the rear. You don't want the rear end kicking around which could send you into a lurid swap. Hitting those big whoops requires dissipating that extra energy in a controlled fashion. The extra rebound will "store" that energy just for a bit, and let the chassis stay stable. Dropping your forks all the way down flush will add some more stability. If you are on a 300, it helps to just let the motor lift the front end over some of the big holes between the whoops, you don't even need the clutch.

Good luck, that race looks like the adventure of a lifetime!