Yup, this is THE controller issue.
Now, Forza got lambasted for not being able to let you turn the wheel as far as you want at any speed, Forza had steering damping, just like you get in real life, you can't just turn the wheel any amount at speed because, physics.
A large portion of the community were crying about it "we want to be able to turn the wheel as far as we want at any speed", well, they've got their wish here!
PCars allows you to, and this is the fundamental reason why people are finding PCars hard to control, and one of the reasons oversteer correction is hard, very hard, you just would not be able to move the steering wheel as far, as quickly in real life as you can in game.