Hi. In the cold weather try 28psi as the tyres will warm up by about 2 degees and the tyre pressure will increase under normal diving.
During the summer , keep to 29 psi.
Too high tyre pressure will make steering feel light, so stay at 28psi during the winter.
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Thanks for all suggestions.
I finally got to try it again today at around 10c dry.
No more steering issues and back to what it was normal to me.
The tyres are hankook ventus S1 evo3. I had the steering problem when it was around 3c.
Nothings changed as I also lost my tyre pressure gauge so didn’t measure but remember it was on the high side.
So it seems the tyre got hard enough due to the low temperature plus a perhaps high psi to affect steering.
No idea why I never felt this kind of sensitive change on my other less sporty cars.
In short,tyre matters 
many thanks
You NEED a tyre pressure guage.
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