yeh for me in my car they were absolutely useless, apart from the fact u cant adjust them on car, they just didnt give me much noticable adjustment, i couldnt get below -1.5 camber on the rear with the camber bushes set to reduce camber as much as possible. car was still quite high as well. same story with caster, best i could get was like 5. same story with my mates car whos runnning the same gear.
as far as springs, i agree, i wouldnt bother with the kingies or whitelines if i had my time again, i guess for the road they were ok, but for any decent track performance u really need to go higher rates and better springs, im currently running eibach but i just ordered some hypercoils to replace the rears, ive heard good things about them and they are a bit cheaper.