if its all over the place and low, try toeing it in a small ammount, it should help straight line stability. i switched from standard wheels to slightly wider 15" compomitive th's, with a lower offset, the extra width at the rear i felt made the rear more stable when cornering. possible just a confidance thing. i lowered mine on spax adjustable dampers and springs, probably lowered it too much though, i think raising it up will help with crashiness and bump steer. just my two cents.