Ideas
I also have to comment on the topic again and may have useful and helpful information
First of all: Play on AI level 102 completely without assistance, only with automatic shifting, i.e. TC off. I drive with the Thrustmaster T598.
In dry conditions, depending on the track, I drive a mediocre car for victory or at least the podium. In the rain, depending on the track, I lose between 1-3 seconds to the AI in the race. The gap isn't quite as big on intermediates, and sometimes even more in heavy rain. In my opinion, the problem lies in the grip of the AI. As soon as it rains, I set the differential to at least 80, so you have more grip. However, the problem is that I can only adjust one differential value during the race when making changes. Another problem is the tyre pressure. The rear tyres quickly lose grip in the rain, especially with Inters, despite the extreme tyre pressure, and get hot differently depending on the track. This problem simply doesn't seem to exist with the AI. As soon as there is a drying line, you can keep up with the AI more. However, what is simply highly unrealistic here is that the AI sometimes drives full wet for ages in inter conditions even though they are significantly faster. Here you have a good chance of catching up with the AI. What's worse, however, is that when the track dries out, the AI sometimes drives the inters almost until they are completely dry and get even faster and faster.
The AI changes tyres far too late and always seems to have a perfect setup for the rain, which is of course unrealistic. You can't drive the inters to the end like the AI because they heat up completely and all grip is lost. In reality, the drivers sometimes use the wet lanes to cool down the tyres, which unfortunately doesn't help at all here, which is of course nonsense. The tyres should already cool down when I drive next to the racing line, which is significantly drier. So unfortunately a lot of things don't fit together in rainy conditions. I would estimate that the AI is set up about 20-25 too well compared to dry conditions. The game is great, but in my opinion that's the biggest problem that you simply can't push aside, otherwise you'll lose your fans again like in F124 for various reasons. Please, I repeat myself, everything else is unimportant this problem must be priority number 1 otherwise you have not understood it.