For what you are doing I would suggest getting slightly tighter springs in the rear and keeping the stock springs in front....try 25 wt. shock oil all around. and that should be good, if you go with any lighter springs on that kind of ruff terrain you will probably be bottoming out so instead of making the front softer (which you would on a track) like i said stiffen up the back... once you get into upgrades i would suggest aluminum as opposed to graphite, I've used both and the aluminum adds a little weight wich helps keeping the front on the ground but doesn't take away from acceleration or top speed (i've clocked the car with both)