Quite an old post, but I'd like to know where you're going to get the suspension from? FRP's aren't meant to have "lowering" springs put on them, the standard set are Eibachs and they're MADE to work with the car.

It's tuned by Tickford (as I'm sure you already know) and they spent a lot of time on the handling side of things; probably the best point of the FRP itself.

Don't change it.