In your formation the central midfild line is very deep a little to deep for me mate.
That's just a rough copy. Obviously Fellaini and Pienaar would play higher up the pitch whereas the defensive midfielders sits and holds:
----------DM----------
Fellaini----------Pienaar
Something like that, two box to box midfielders and a holding player. I've never seen a player run as much as Pienaar, his engine is superb. He's like Dirk Kuyt with quality.
Classic!