I've got the s28i M Sport in US, and it is really a great ride.
I noticed when I picked it up In Germany that it swayed like wind blowing it at 120mph while trying to follow the big boys on the autobahn.
I have staggered 8x18 and 9x18 wheels, so 30 mm wider 255/40r18 P7's on back.
The track is already stock with 1.1 inch wider in back, so I put 12mm spacer just on fronts, and got rid of sway.
Now yours probably has that normal roll if it'st not m sport and a sway might help if it's not too stiff.
If you want to get rid of understeer, and balance steering with minimal effort, I think you could get an alignment, and make sure to dial out some of that negative camber on back wheels that most all cars have now.
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