Pretty standard wear for a tire like that. Some rice-graining and "material movement" is normal.
The tiny chunking is somewhat symptomatic of overheating or overdriving, but not a ton you can do except maybe be more aware of your slip angles and monitor pressures carefully.
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Now: 2017 Corvette Grand Sport, 2021 AMG C63 S sedan
Past: 2011.5 M3 sedan ZCP
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