Hmmm well I just picked up an S120 but have'nt put any laps on it yet so I'm not going to try and advise you on how to make any exact setup changes. But in general if the car is too locked in you need to free it up. The tires your using is very important, say your on a high bite track and your using super soft tires like white or grey, that could cause the problem your having. Just a suggestion but I'd post your questin in the S120 thread, but you really need to know what tires, surface grip and the details of your current setup before anyone can be of very much help. As to saucing the tires this again can depend on the amount of bite but in general you sauce full rear and inner 1/2 to 1/3 of the front.