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My bet is bent wheels, wheel bearings, or rotors. After solving the shimmy with the inserts, it came back briefly. Turns out I bent 3 of 4 MRR wheels somehow. I now have forged GM 2017 1LE wheels. You can take them to a tire shop and have them spun on a wheel balancer. You can visually see if they have runout usually.
I replaced my wheel bearings at 40k miles and rears at 50k miles. The fronts groaned and when spun on the hub (caliper removed) clicked.
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2020 ZL1 1LE [Moroso SC Expansion Tank, otherwise stock]
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