You have to remember there is always going to be some compromise by Renault on the Clio stiffness. It has to be used everyday by the majority of people not on track so it is always going to be softer than a race car.
I think coilovers are good if you want a more focused set up, but the likes of kw are still a compromise between road and track. Best bet will be Ohlins or AST etc. but that is serious £££. As ever it is personal preference and nicer
I suppose it also depends on the cost of the Renault shocks too.