PS4 difficulty

I've semi recently started playing Assetto Corsa on PS4 using a Thrustmaster TGT and the T-LCM pedals. I'm most of the way through the career mode. I recently decided I wanted a challenge as during the extreme races which are typically 30 laps I end up lapping the entire grid when I'm half way through the race on some tracks with the difficulty set to easy. I tried setting it to normal, but it seems to suddenly become much much harder to the point that I'm yet to win a race against the AI on normal.

Is there something wrong with the AI difficulty settings on PS4?