The track down here is like you've described. It's very hard packed with an almost dusting of loose dirt on top. They water the track a bit but it doesn't do as much to the hardness that I would like.
Everyone here runs Crimefighters. Really, everyone. A few guys at practice were running whatever ofna tires, but during the races it's 99% crimefighters. It's what I have on my buggy too (m2 compound), and it seems to work well.
I also have a set of Knuckles in the XTR compound but I haven't had the chance to really try them out yet. My guess is that they won't grip quite as well but I do like the feel of the knuckles in general so who knows.
As a footnote, I took some proline white dish rims and attempted to dye them grey, with some black dye. I am now the proud owner of four purple rims with crimefighters attached. Since I broke my wing, and couldn't get a black one, I got a white one and said what the hell, so I dyed it purple too so it would match the rims. You know? It actually looks pretty cool!