Is rain ai too fast or is it..

I don't think it has much to do with the TC levels used by the players - although this obviously plays a very important part too - BUT.. I believe it has more to do with the fact of how unbalanced (and fast/strong/unfair) the AIs are in the game at the moment - even on a dry track - and it gets even worse on the wet, especially because of the tyre temps - the AIs can keep their Inters or Full Wets constantly on the ideal temp easily, but the players have a hard time keeping the tyres warm - even when the values for tyre pressure are good - I can still lose temp on the tyres lap after lap, until I lose all the grip and it gets impossible to keep the car on track, so.. long story short: yes, the AIs are a bit too strong in the rain, but it's not only just their top speed, acceleration, or grip  it's ALL of these + tyre temps that they can keep without any struggles..

It's just super frustrating to race against them in the rain..