I purchased the zaino system (Z-2, ZFX, Z-6, Z-7) but I didn't get the Z-5 scratch remover, and Im wondering if I should have. My xfire is graphite and it has streaks, not swirl marks, like all of the other xfires had at the chrysler dealers. Have any of the other xfire owners with graphite or black had success with just Z-2, or has anyone tried the Z-5 before Z-2 and had good results.??. I would rather not order the Z-5 if I don't have to...