I have Pirelli Pzero 19's with about 15,000 miles on them with none of the issues you describe. I did not go to 20s because the roads here are bad. Even with the 19s I had to have 3 rims repaired in the last year. (Insurance). If you do a swap as suggested, you might also try putting on 19s.
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BMWCCA
Current: 23 760ix (Carbon Black/Tartufo) (after first one totaled) '23 X3; '23 MB E Wagon
Prior: BMWs (3,5,7 & 8 series (2x!)) X3, MB (C, E, and S), Alfa GTV, MGB, Audi (A4, A6), Saab, Volvo, Toyota, Lincoln, Chrysler, Oldsmobile, Chevy, Rambler.
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