Stem controller's new identity does not change tor IP
Your code looks good and it appears to be working based on your comments and the output I see.
Of the 64-79 nodes in Italy you see on that page, only a few are actually exits (you need to look at the icon flags to determine this). According to https://atlas.torproject.org/#search/country:it%20flag:Exitthere are far fewer exits in Italy that you thought. It looks like there are about 6 Exits online at the time of writing.
At least one has a really low capacity (75 KiB/s) and probably can't serve your requests, and one other I see does not allow exit traffic on port 80 or 443 (so it's not suitable and won't be selected for your use).
So in conclusion, the fact that you're only getting 2 IP's sounds about right. It's a network capacity issue (being that there aren't a desirable amount of exits in the country you want) and not a code issue.