Real life steering degrees.
https://www.gtplanet.net/forum/showthread.php?t=202903
900* or more. (2.5 or more full turns lock to lock) Usually anything from average road cars to sports cars.
720* + or - (2.0 more or less turns lock to lock) Drift cars. Multiple classes of Rally cars (group N)
540* + or - (1.5 more or less turns lock to lock) GT1 and 3 spec race cars, and WRC Rally cars.
360* + or - (1.0 more or less turns lock to lock) Formula 1 cars.
With that you have non linearities sort of working against each other, going from a log response at low speed towards an exp response at high speeds. It's about as far as you can come from a realistic steering response in a race car. Each to his own, of course, but I'd really try a sens=50/speedsens=0 setting - that's the one setting that there's actually nothing weird about... Its like speed and steering sensitivity. They must be set to 100 or else it feels weird to me.
Steering sens 50, for linear
Speed sens 0, so same at sens regardless of speed ( ie no PAS)
540 rot... Though I did use 450 for a long time... It's just what you get used to.
At the moment, I'm not tuning in cars, as there are so many loaner races... so I just get used to whatever I'm given
For OP, I read an 8% quick rack, on a Caterham given around 650 rot.
But for racing you use a 22% rack, unfortunately not quite sure what it's 22% of.
I can tell you though, with a 22 rack it's tricky manuerving it around a paddock.