If you don't have the straight line speed issue it's likely because you, like I had done, lowered your downforce to keep up with them on the straights. Then I thought my low corner speed was due to other car setup parameters. This is why your corner speed is low. This was how I was problem solving this issue before I found this AI fix. Because if I had setup my car with enough downforce to match the AI sector times in the lower speed sectors, they'd FLY by me on the straights. Also, aero setup is not the same as prior years. Google the David Greco posts about this. In case I'm not clear, when you raise downforce to get the normal corner speed, you'll then see the huge speed deficit on the straights.