I am 18 months into SQ5 ownership and was also exasperated by the poor ride, having owned 3 A6 Avants which were all brilliant (other than the notorious BSG issue on the last one - well documented elsewhere in this forum). Having played extensively with tyre pressures and seeing as I don't drive at the limit on German Autobahns, (these days anyhow!), I have found that running pressures at 35 front and 32 rear with Individual ride setting on Comfort does significantly improve ride quality without compromising handling. It also reduces road noise on the (still original) Pirelli Scorpion Verde tyres, which are wearing very slowly. I do intend to switch them to a lower noise brand when they have worn a bit more.