The AI is all over the place.
I'm doing the Clio Cup at 100%, in practice at Silverstone they were a second quicker than me. In qualifying I managed pole position with a similar lap time to my best practice time, which ended up being a second quicker than P2. Then in a full 14 lap race I finished 5th over 8 seconds behind the lead. Even though during the race I was lapping consistently around my pole time and even a few laps were a second quicker than my pole time. So as I quicker and quicker during each session, the AI went quicker, slower, even quicker.
The dynamic weather is just as bad.
Started Oulton Park in the fog and it cleared and brightened up as the time of day progressed. Then the late afternoon race was clear and went foggy in the space of 2 laps.