When I went from 19s to 20s, the tcase was unhappy because of the wear on the tires. Simple recalibration of the tcase should fix your problem.
Your tire sizes are within spec so don't see any issues there.
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2017 X5 XDrive35i X-Line | Sophisto Grey | MHD Full Flexfuel Tuned | Mosselman Turbo| Sutphin Tuning TCU | Nostrum Stage 2 HPFP | ER Charge Pipe | BimmerHausPerformance Intake and Inlet | ApexBuilt Catted DP | VRSF FMIC | Zeitronix Flexfuel Kit | KateCool Oil Cooler | Variant Wheels | Conti DWS06+ |
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