another detail that gets overlooked often are things like bushings. rubber wears out over time, our 240s are old. our rubbers are old. replacing them with newer/stiffer is better.
I don't know it for a fact, i've never tested it, but they say that a stock suspension with aftermarket bushings and what not will out perform a suspension that just has coilovers. Coilovers are great, but there is so much more that you can do.