Hi guys, sorry for delay in getting back to you all.
Re the ride quality on the 20's - absolutely fine. TBH I thought it wouldn't be anywhere near as nice as it is. Whoever is trying to tell you to take the 19's over the 20's, don't listen to them. Tyres will not be cheap to replace though... It has Bridgestone Potenza RE050A's. I took some photo's today but just realised that I can't read the codes on the side. I'll get that for you chaps tomorrow (as well as the placard which I forgot to check). In other news, got plates to match the colour of the car today. Pretty happy with how they look compared to the blue and white ones that came on the car. Also had a Blackvue DR650GW-2CH installed today - picture quality is pretty spot on. Will hopefully throw a vid up when I have a fiddle with the settings etc.
Only thing still bugging me is what to do about the suspension... I still can't figure out what I want.