my car does not seem to handle as well as i thought it would?

my set up is: 16 inch alloys, polybushed alround, front strutbrace, adjustable tca's set to 0.5 i think, koni adjustables 25mm drop

could it be sagging spring or something?
whats the next stage i have heard that there is a trick rs 1600i set up but there not very common, would it fit or does anyone make anything like it for the rs turbo??

my misses can keep up round the bends in the puma ! help!!