Personally, and this is only in my limited experience, the whole 155\Tipo\Dedra monocoque just doesn't have the torsional rigidity to apply the normal handling formula.
I can't be the only one to have worried when they've jacked up one side the front of the car and then tried to open the door.
All I can say is that when I stiffened up the front with a Dedra ARB and a strut brace, and then added a little more toe in, the front end of the car felt much more controlled, gave more confidence when turning in and seemed to grip better. The Dedra ARB is only slightly thicker than the Q4 one, so an even thicker one might help more or it might not.

If you compare the front setup of the 155 to the rear, the rear is by design a much better starting point to hang suspension from as its all hung from the one subframe, and the subframe is pretty beefy to start with.

Just my 2p worth.