Hey Chris, I went Man City too after failing with Liverpool, finished 6th in my first season (bought Huntelaar, Diarra and Srna, I recommend all these players) and I couldn't settle on a formation but then found one on another site, a 433 and then in my second season I finished 2nd, semifinals of the Uefa Cup and FA Cup winners!! was soooo happy, it's a great little tactic that I will will posting 2nite.
I havn't had much joy in getting performances out of players like Robinho, Ireland or Johnson so have sold all but Robinho and have just bought Aguero for my new season, also Micah Richards is a colossus at CB.