Smaller wheels equal better comfort and handling exactly the way Alfa wanted it to be... They know nothing obviously
Ha ha, contentious issue!
I think we all need to accept that it is a compromise, and you can't have it all. 16s look too small to me, and with a V6 GT and Brembo calipers, do not fit!
Alfa's suspension design is also a compromise. It can be improved, and there is no doubt about this. But of course, it depends on the road surface too. The 'best handling' will likely be the stiffest, but only suit a billiard table smooth track; thus, not the 'best' for a street car. No blanket statements can apply; it's compromise.
Lower profile, wider tyres, and lowering all contribute to increased road noise. 'Too much' is a subjective thing, however some tyres are noisier than others, for sure.
I haven't used Dunlop SP's before, so can't comment. My car's OE tyres were Bridgestone RE050; they were quiet from memory, but also fairly stiff side walls, and the ride comfort was not great. I currently have Toyo Proxes4, but these were a little noisier (and 225/35R19 size), but comfort went up (except with the sharp ridges)!