Hello gareth
the tyres are extra load yes I know what your saying about the low profile tyres and big rims I had similar problem years ago on a E46 M3 19s for show 18s for go😂
I was hoping suspension technology had moved on from then that was some years ago now,I'm going to percaver with refreshing suspension as I think the shocks haven't been swapped out since new so fingers crossed ride quality will be some what better.