I have the M chassis with 19 "Pirelli Zero RFT
That's really bad, I feel like my suspension feels terrible and awful on 19 "RFT with m suspension
Its terribly bumpy at slow speeds
Your experience is opposite to other posts on bimmerpost and bimmerfest
G20 owners seem to see a 50-60% improvement on ride quality with non RFTs on 19 "at slow speeds