Speaking of crabbing. My 2020 e63s got PS4S and yes, the skipping is mad. They even told me when I picked it up from the dealer that this is normal (they warned me straight away). For winter I have also the Alpin 4 MO as 19" - same size rather than staggered (like the 20" that are fitted from factory) - and indeed not a single skip. But as someone mentioned, and I know this is an old thread, but personally I only ever had the issue with sportier cars like the RS6 and now E63S ... My A6 didn't have that, nor did my standard Diesel E Class ...