....but I wanted something more fun to drive, so I am installing .... stiff springs and bar, Bilstein shocks, etc.
Be careful about installing truck suspension on so light a car as a Giulietta. Not only will it give you miserable ride quality, but I doubt it will cut your lap times much. I had KYB shocks on my 101 Giulia for awhile, and the feather-light rear end would just hop over bumps, rather than roll over them. You don't get much resistance to lateral forces when your tires are off the ground!
I built a couple of Carrera Panamericana cars to this spec years ago, and they were a blast to drive.
It sounds like you know what you are doing. But will use this latest Giulietta in events like the Panamericana?