aaron, i run on a dusty/hard packed track with one 6 inch jump. i checked Mike Dunn's setup for the same type of surface, he used 60wt and 53/54 up front. he used 50wt 53/53 in the rear. fr and rr were set to bones level ride height. check this link:
http://www.jamminproducts.com/x1supMD.pdf