What should be used is a version between the 4-1-2-1-2 and 4-1-3-2.
Buffon when fit
Caceres Bonnucci Chiellini Grosso
----------------Sissoko
---Pepe-------Diego-------Marchisio
------------Trezegol----Iaquinta
It's not lightweight defensively and it is great offensively. With the 3 to 1 tactics mastered and as I know Delneri made them practice diagonal 35 meter balls.
Marchisio needs to shift his movement 20 cm towards the ball in his box of 'D3' and he has the tactical intelligence to do so. Pepe will use his speed but needs to work on his end product.
Sissoko must not get crocked a lot because Melo and Poulsen are not trustworthy.
For the heavy balls Bonnucci will press further forward and let Chelleini do the dirty work at the back. In terms of drill movement it should be specific, and orders of course vary like the opponent but the team value and compactness must not change.