You might try a couple of things. First make sure you clean the metal really good before the final buffing, use a new clean cotton buff (the ones that are not sewn together made from cotton) and make yourself something to rake the buff before applying the compound (drive some nails thru a piece of wood and use the nail points to rake the cotton buff before applying the compound as it breaks up and fluffs the outside edge of the buff). Use a light pressure. It looks like you have either dirt or maybe some metal from an earlier buffing stuck in your buffing wheel and that is where you are getting the scratches. Aluminum is soft so it scratches very easy. Never use the same buffing wheel for all the buffing especially the final buff. For all the metals that I do...I take it to a final sanding using 1000 grit paper, then comes the polish.
Hope this might help you
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