That seems to be the crux of the conversation, that of mixing racing setups with ordinary driving on public highways, where potential higher speed spinouts, such as I've witnessed, can endanger the driver, passengers, and nearby drivers.
Yes, one can make the car seem more spritely in low or medium speed cornering by increasing oversteer, but at higher speeds this can lead to terminal spinout oversteer. This is regarded by engineers as not desirable for a real reason, it being potentially dangerous for the driver, his passengers, and those drivers around them for normal driving on highways. It's just the dynamics of the vehicle.
I did mention that racing setups can be quite different, and for some racing situations and track designs, increased oversteer can be desirable, but not for ordinary driving on higher speed highways.
The Stig most are not, lol.
I've been driving Alfas for 5 decades here around the country and abroad, and have done testing with various models, including a little track time with Alfa test drivers, and this was their conclusion for the average Alfa driver, even those with some skill. I know I would rather have a little more understeer in order to avoid excessive high speed oversteer, seeing as how I may drive at 80-100 mph on some freeways, 80 mph (at least) being legal on some highways) in the West, on vacation trips to Texas or Yellowstone NP. Think about that deer or elk jumping out in front of you at speed!
Having said that, however, go ahead, trying different tire pressures front and rear at various speeds on a winding road, and on the highway, trying a little gentle swerving at different higher speeds. Experiment. Draw your own conclusions based on the type of driving you will primarily do. Just understand the engineering basis for what you find.