As for these two penalties we got in the last 3 matches, I'm not even sure if it can be categorized as the refs helping the big teams.
I think it's more about Del Piero than Juve. Just look at the penalty we got against Lazio. Amauri fell like that, missing the ball, at least 20 times this season and he never won us a penalty. Before Del Piero came back from injury, we won only 1 penalty on more than 20 matches (Serie A+CL). Even now we don't play the ball in the box so we can't put ourselves in situations to win penalties, but Del Piero's reputation of an honest player and Italian legend won us those penalties.
Even if he played for Sampdoria he would have been given these penalties.