I understand the frustration,,, Different brackets certainly wouldn't hurt in this quest, but haven't you already covered the brackets with tape once to rule them out as the source?
Roy might be the only one with the new brackets. (Mine look like Buzz's)
I'm running in the middle set of the 3 bracket to bracket options. (Brackets were shipped to me in the outermost /highest set) Rake set almost exactly to OEM. 15 inch shield.