FearLess Cheat Engine

I did these; Grip: C5: 1 C4: 0.900 C3: 0.800 C2: 0.700 C1: 0.600 it fix a little bit but not much. I didn't touch tyre wear yet. Has anyone tested more on this? Has it made a difference? Also is it c1, c2 are Hard, c3 Medium and c4,c5 Soft? So every race you have 3 compounds. example C1 C2 C3 or C3...