Xeno:

My particular mid-size front-wheel drive specifies 32psi, front and rear.
It already has 'light'(easy) steering due to its wide, 50-series low profile
tires.

So for a while, I took it upon myself to experiment with adding 2psi to
the heavier axle(the engine) and removing 1-2psi from the lighter rear
axle. So I had a set up of 34front, 31rear.

While the back end seemed more planted, the steering actually became
more 'dartier' than ever on the highway, and I found I had to make more
corrections thn ever to stay in a lane!

During the third week, I reset all tires back to 32psi cold, and the car
calmed down, and actually drive as intended. I'm actually running
33psi cold all around now, because the weather here is starting to
get cooler, and handling is still fine.

So for my specific car, a 56/44 split weight front wheel driver, using the
same front/rear pressure - as specified - actually works!

Can BMW and Audi do different front/back pressures simoly because
their models' axle weights are closer to 50/50?