Relatively, Berlusconi's best province with 'only' 8% loss against 2008 has ben Bolzano, which at the same time is Grillo's worst region. Obviously the province's linguistic divide has resulted in SVP (CD) vs. Center-Right vote polarisation.
Berlusconi really didn't have very far to fall in South Tyrol; even in 2008 he only got 16% there. So an 8% loss is quite bad, really.
I've been looking at some of the Ladin areas. In South Tyrol, it seems that they basically vote like the German speakers (e.g. Urtijëi: SVP 48% other centre left 14% Freiheitlichen 14% Monti 8% Berlusconi 8% Grillo 7%). In Trentino, on the other hand, Berlusconi and Monti dominate (e.g. Vigo di Fassa: Monti 37% Berlusconi 28% Grillo 17% centre left including SVP 12%).
I thought they were connected to the Austrian right (FPÖ and BZÖ) which suggests that they're not really what I'd think of as "centre right". They're also separatist.