Around December time I switched to a bold 3-5-2 formation and it proved to work much better than 4-2-3-1. Your back three is made up of (newly purchased) Kurt Zouma, Chancel Mbemba and Fabricio Coloccini as your competent libero. The formation really works with Daryl Janmaat on the right and Rolando Aarons playing as left wing back. Georginio Wijnaldum is best used as the number ten with Moussa Sissoko and (newly purchased) Jonjo Shelvey sitting behind.