what are your wheel alignment settings (toe, camber, castor, ride height - front and rear) and what is it specifically about the handling that you want to improve (ie does it understeer, oversteer, and where: corner entry, mid corner or corner exit)? Also what tyres are you running, how new, and what pressures do you run them at?
I know, lots of questions but it can help narrow things down.
Also, have you had much driver training/advice? Its funny how often approach to a corner makes a difference to the problems you are having