From a fellow owner, all I have to say is welcome to the Brembo GT life. Normal by most accounts. Even OEM PP Brembo owners have commented about increased noise.
I've had mine for about a 20 months (> 20k miles and > 10 track days) and am usually driving on the provided OE-spec pads on the street. I swap out to dedicated track pads for road courses.
I distinctly remember them being squeaky when I first got them (some lady even asked if something was wrong with my brakes), but having dailied track pads for 2 years prior to that it didn't bother me. They've gotten a little quieter as they've aged, but they still make noise from time to time. Noise was excessive on my track set over the first couple of uses, but they have also since quieted down.
Speaking from experience: no amount of bedding changed initial noise. At the time, I did a couple of full bed-ins to temperature on the OE-spec pads (10x 60-30MPH, cool, then 10x 60-10MPH; hot enough you can smell the compound, sometimes see smoke), but the noise always came back not too long after. These days I don't bother with a comprehensive bed-in on the street set. I don't use any brake grease as it generally burns off at the track anyway. I think noise characteristics will start to improve once you really wear into the rotor material, but obviously that just part of normal brake usage (I'm about 0.7mm into the rotor thickness).
I have a couple of theories on why the GT may be more susceptible (wear-off of the zinc coated rotor, presence of slots), but they are just speculation. I'm interested to see if things are any different with standard blank rotors, but I have my eyes set on 2pc rotors down the road
