A friend of mine who drives the same car with full stock configuration is going to give the measurements from wheel centre to wings, so we'll know if the lowering is excessive or not.
Here is the geometry report: https://drive.google.com/file/d/0B5X...ew?usp=sharing
"Avant Gauche" = Front left
"Avant Droite" = Front right
"Arričre Gauche" = Rear left
"Arričre Droite" = Rear right
"Carrossage" = Camber
"Chasse" = Pull
"Para." stands for Parallčlisme (same word as English, obviously).
In the tables, "avant" stands for 'before [adjustment]' and "actuel" stands for 'after [adjustment]', while "zone correcte" lists the range of corrections which Alfa recommends for sport kit chassis.
They used a proper 4-wheels adjustment bench, but the tyre fitter told me that he was unable to act on the adjustment bolts enough to bring back the camber in the recommandation. He didn't found the camber bolts for the rear, so he hasn't touched anything here.