No matter how hot the tyre is, if the sidewall is on the tarmac beacuse the tyre is folding over itself, you wont be getting much grip.
Recommended tyre pressure are there for a reason. Vw wouldn't put them in the fuel flap for dry weather only.

And they are cold pressures too. Meaning that the pressure will increase as the tyre heats.
Havent found a ditch yet on those pressures in the rain. Lower profile tyres need higher pressures too, due to the usually lower load rating and smaller sidewall.