There are 3 steering types.
1) Standard - power assisted and linear ratio
2) Servotronic - variable power assist and linear ratio
3) Variable sport steering - Variable power assist and variable ratio.
Variable ratio means that the steering is more dull around center, and quicker when turning sharply at low speed.
It is possible that your issue could be coding related.
I see some people are not very impressed by the variable ratio...
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