OK, well there are no settings outside the game. But perhaps you should try changing the settings inside the game. I don't remember what they default to, but I know I definitely needed to change them from that because it wasn't great...
Just to update you on this: I drove a 512BB today, with a widebody, wide offset on the wheels and a sports suspension that isn't adjustable but does lower the ride height. I last drove this in 1.48 and I really enjoyed the balance. I could move the weight around to where I want it and let it adjust the angle of the car as needed to tuck the nose in, set up a classic drift or put more weight on the back tyres to kill some oversteer.
Today it felt like the balance was about the same but the oversteer was catching me by surprise and I kept spinning. I went to the wheel settings, which were still on default (6ffb and 4 or 5 on sensitivity.. I can't remember which). Pushed the sensitivity up to max (10?) And FFB up one to 7 because the wheel had felt a little light. This was much improved and now I could feel the oversteer developing, and react in time. So, yes, messing with the settings has helped me with 1.5, thank you.
On topic of new physics, I also drove another old favourite of mine today, a Mitsubishi GTO with a chunk of power and suspension mods. It was never a car with finesse but it was effective and safe. I drove this at the Turbo Sports round of the weekly challenges at Nuerburgring today. It had that binary or low resolution feeling to its reactions that I had mentioned a few posts back that I had in the R32 GT-R.
More or less it feels like when I turn the wheel, instead of the signals going to the game as a smooth change in number of degrees of lock added or removed, it feels like the game is processing the changes in 10 degree chunks. I get a similar feeling about the car's suspension reaction to brakes or power, like it is going up in 10% chunks instead of finer inputs. It doesn't feel like this in acceleration or deceleration, only in suspension movement. So if I'm pointed a bit wide of my chosen line in a corner and turn a bit more, or lift off the throttle a little to tighten my line, the car will react very coarsely, or twitchily and the nose will dive right past my chosen line in a single lurch instead of letting me drift back on to it. The pitch changes feel equally coarse. This is only in certain cars.
Meanwhile, while I was following the Imprezas in 1st and 2nd places (a yellow one and a blue 22B), on some corners they were moving around on their suspension in a way that looked quite unnatural to me, very coarse pogoing and corkscrewing, in a way that looked very much like my car felt to drive. But only on some corners. It was very clear on VR where the cars take up a big chunk of visible space when you are following them, and I could see it on the replay too but it was much less pronounced when using the regular flat screen views because the cars are just.. smaller.
I seem to have this issue mostly on front engined 4WD cars, but not all of them. I drove the 155 later on and that felt great.