4 out of the last 5 times I've been it's been rubber down. It's certainly not the tire compound, run the same tire everywhere. It's pretty simple, when you pack dirt down as hard as concrete and never actually turn the track over its going to be dusty, slick, and will likely take rubber, and water isn't going to correct it. hard to run local shows when you destroy a minimum of three tires a night for 1500 to win.