every time I see your polish pictures I had a little seizure. WOW! You must have a good buffing wheel setup, my 6" bench grinder with bad bearings turned terrible polish jobs, replaced it with an 8" and still had some grain showing through. I found it easier to sand 200, 400, 600, #00 steel wool/WD40, #0000 steel wool/WD40, Mother's polish.
The grain showing through is not so much a problem with the buffer, its the type of mop used and the grade of compound used (no sanding needed) that will eliminate any grain issue, and a few hours experience helps too. To help maintain consistant results when polishing alloys for the final finish it helps to use only one mop with the final polishing compound and don't use it for any other job, just final polishing. By not contaminating the mop with other types of polishing compound and using a fine cotton polish mop you will have that super mirror finish, its way past the stock look of course but if its bling you want thats the way to get it, cheers.
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