Not Ranked
Mr. Pink
Give John Panfil at Anthem Motors in Phoenix a call. He is extremely knowledgeable about tire/wheel problems of the sort you speak of on Cobras. Sounds like you have done about everything you can. It won't cost you anything but the phone call. 623/879-0930
I know from experience that a good burnout doesn't get rid of "high spots". I guess it could but because of high rotational forces deforming the tire, it generally doesn't and can make it worse. Shaving in my experience just reduces the mass to be balanced, making the balancing more precise with a given machine. It can help in some cases. Shaving does work wonders for cornering traction on a race track.
It takes state of the art balancing equipment and a patient operator who is more artist than technician to get rid of the problem you describe. This assumes the problem is balance and not one of a dozen other things that could cause the problem.
I'm spending just over $800 on the new SPF to have John go through the suspension, wheels and tires with a microscope and gram scale just to preclude any problems. I consider it money well spent. Call it proactive if you like. Good luck.
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