Here are also some notes on the AI individual specific values (in green in the example file above) for my talent files:
RaceAbility=0.2
Range 0.0 - 6.2 (0.0 is best). This seems to follow a progressive scale as it's hard to note any difference between 0.0 and 3.0 but beyond that span, an AI driver will start to be slower the longer the race goes although the value doesn't affect the driver's best lap times.
RainAbility=0.2
Same as RaceAbility but for wet conditions.
CorneringMult=0.875
This is the most important value to set the speed of an individual AI driver. Can really be set to anything between 0.500 and 0.999 (higher is faster) but is of course also related to general AI parameters such as QualRatio, RaceRatio, AIDryGrip, AIWetGrip, AISens, and AIGripMult.