Tyres:
225/50-17" Goodyears

Fronts are all season profile, the rears are softer winter tyres.
I would think the softer compound winter tyres would have more grip on wet roads.

Pressures are (going from memory) 2.6bar (37-38psi) at the rear and 2.8bar (40-41psi) at the front.
Mainly to reduce rolling resistance for economy reasons, but I could try and lower the rear pressures a bit more.

A few years ago I bought a used pickup rear axle with this 3.55 lim.slip unit in it. It had a cone-type Auburn SureGrip.
I used the 3rd member in my current 8-3/4" axle and used quality LSD-oil.

At first I thought I could notice some slack in the rear axle when going from Drive to Reverse or back.
And when jacked up, if I grabbed one tire, I could muscle rotate it against the lim.slip to take up the internal gear slack. I presumed the unit was on it's way out and a new one would have to be installed in time or have the old one machined.

But as plenty of drivingtime went by this noticable slack felt to have disappeared. I think the unit tightened up a bit and is working as good as ever.

The 318 doesn't have the power to break the tyres loose on dry pavement.