I've broken in a few new pairs of G&Gs recently - in my experience they do get roomier as the footbed settles. So I wouldn't worry too much about them being tight brand new. It all depends on your preference how snug you'd like the fit to be anyway.
I am hoping to visit NSM in Napoli in the coming months, can anyone suggest the best way to get in touch with them to arrange an appointment? I have emailed the address on the website twice and did not receive any reply. Does Mina have a personal address where I might have more luck?