Just a thought - the limited edition (not for Oz) 182 trophy had a modified suspension with Sachs shockers and was lowered about 15mm over standard. It would be interesting to find out what RenaultSport did about adjusting roll centres - if anything. I know the Trophy had uprated hubs.
You could try contacting Renault, although I doubt they would know anything about the Trophy, or you could try contacting the guys at Renotech in Sydney - who know lots about everything!!
There is a roll centre correction kit available on the web from UK, I think. Involves changing hubs to Scenic ones and other additions in the kit.