Just tried steering ratio at 6 to 1 and seems better. Going to try different cars. BTW. Have latest software version.
Also, go to
windows control panel
devices and printers
right click on the relevant controller
select game controller settings
select your controller from the box that appears
select properties.
Try altering the rotation in there and return to the game each to see if it helps. (I think you can do this while ALT - Tabbing out of the game each time, to save constantly exiting and restarting the game).
Just tried this and cannot see where i can alt. rotation. in this screen. Thanks
I think I had the same issues as you, i.e. the car would not turn (i.e. super understeer) and then suddenly mid turn bam, it would turn to super oversteer.
The issue for me was that there is a settings where the steering input is adjusted based on speed. This is the 'Speed sensitivity' under the controls. I have it now at 0, I think when I had the issues, it was at 90.
The setting means that at faster speeds the steering is less sensitive.
What this does, is when you go into corner and you start turning, let's say 25% to the left on the steering wheel, the steering is set to 5%. As you are breaking/slowing down, even if you keep the steering input the same, the game actually increases the steering . So now let's say you dropped the speed from 250 to 150, it might be that without changing the steering input, your steering changed from 5% to 50% or something like that during the slowing down.
And to add on top with understeer, you tend to brake/slow down + steer more, so at some crucial moment, the understeer turns into massive oversteer with this "speed sensitivity'. This can be truly a game breaking experience.
Cheers.