Yep, the brake fluid upgrade is a relatively cheap bit of "insurance" for spirited driving. Where I drive loss of brake power == "die now" since missing a turn means either running into a cliff or flying off of a cliff.Do you have a source for aluminum hat 2-piece rotors that are an OEM replacement? Even if you stick with the stock brakes, I'd recommend at the very least you upgrade the brake fluid to a DOT4 grade; Motul RBF 600 is pretty popular with the weekend track crowd. You might cook your factory brakes, but you won't lose pedal pressure. Another good idea is to replace the brake lines at the wheels with stainless steel lines. The may weigh a little more than the rubber ones, but they won't expand with heat which can cause mushy braking.
The P-Zeros are for track guys that consider a set of tires a weekend consumable. Your choice of Michelin's is probably the best for your application, unless you want to have just a summer set of wheels and tires.
$$ brake lines are less clear if they are a worthwhile change. I had them on my E-type and they sure look good, but you cannot tell by physical inspection if the lining inside of an $$ line is deteriorating. With rubber lines there will usually be some soft spots apparent before they fail. OTOH, $$ lines seem less likely to be damaged by road debris. I was told that mushy braking has more to do with the brake fluid than the brake lines.
For me the point with the Michelin A/S 3+ is that they are all seasons with near summer tire performance. I need all seasons since summer nights are often cold high in the mountains. I don't think any of the competition comes close.
I do not know of a source for 2 piece rotors for Giulia 2.0T at this time. Stoptech makes something that is close and I am hoping they can be convinced to make a kit that will fit. They seem to be much more interested in promoting their "big brake" kits with the 2 piece rotors which typically yield larger diameter brakes for about the OEM weight. One downside with a big brake kit besides the risk of upsetting the Nannies is that clearance to the rim is reduced. CF rims are heat sensitive so more clearance between the rim and the brake is a good thing.
Interestingly, an Etype has 0 unsprung rear brake weight: the brakes are mounted on the sides of the differential. I was told that some Corvettes have this arrangement as well. The problem with this scheme is that the rear brake cooling is poor.