Hi ChopChop,
Eibach do shorter springs for the Giulia. Apparently lowering the car around 25mm.
Not sure about the Giulia, however most cars today feature sensors that measure the car ride height and general chassis attitude.
Vehicle stability control and headlight aiming would probably use info from the ride height and general suspension displacement sensors.
Give Alex a call at Alfa Donnini Repairs in Melbourne. He is very knowledgeable with regard to the latest Alfas and possibly forcing the chassis control unit to re-learn reduced ride height. I understand he has all the factory diagnostic toys.
Colin