AI gaining Massive Speed on the straights

It’s just the slow corners that are killing me.  Doesn’t want ai car is infront off me coming out off the last chicane at imola. They gain something stupid like half a second:  

But then I get great exit speed onto the main straight compared to the ai infront where it’s blatantly clear a blind person could see how much faster I am. But as soon as I’m right up it’s gear box ers and drs all go.  The ai just manages to maintain enough speed to stay just that bit infront  I can’t even attempt a deep dive