When they play strong NT it is possible that they pass all 12-14 balanced over the 1NT response and that they tend to upgrade 14 counts, the vast majority of Italian pairs play this way in a 5M 2/1 context, is risky but it is playable, when they are playing the weak NT (10-13) I don't think they can put any 14 count in there as 1NT is already wide, they must be real confident in their declarer skills if they are bidding 2NT with any 15 in a hand were you are likely in a misfit. By the way, over a 1H opening do you support with 3 card heart suit or do you bid 1NT?