RDCR07
Not a bad guy (Whale Killer)
You be best suited to a 4-2-3-1 formation with such players, having Carrick so deep wouldn't suit him or Modric so it would be best for them to be beside one another with two wingers and a No.10 ahead of them.
Saying that I think Kagawa would completely unbalance you in that regard, it would be better to forget about him. Have Rooney in the No.10 role flanked by two wingers with Hernandez in front of him instead of bringing in somebody new who couldn't possibly be better than Rooney in that regard, forcing him to become a goal hanger rather than someone more creative.
As such next season if I were you this is how I would be setting up:
De Gea
Rafael Smalling Vidic New-LB
Carrick New-CM
Valencia Rooney Young
Hernandez
What he posted was similar to what you posted. He just posted Carrick below Modric. I don't know why he went with the diamond formation though. Now with Kagawa, it will be similar.
Carrick--------Scholes
Valencia--------Kagawa----------Nani
Rooney
Valencia--------Kagawa----------Nani
Rooney