What duties and roles have you set for your DM ? Deep-lying playmaker with support duty ? At first I was temped to play with DM, like you and not with CM, but I thaught that my AMC's needed some support. If you have very good central defenders and a CM that can defend a little, it works just fine that way. I'm glad that my tactic was a start for you and you're trying to improve it. Keep it up and let me know how it develops.
P.S Claudio Marchisio, Muntari, Obi Mikel and Miguel Veloso would suit perfectly as CM for this tactic . They all can support the attack and the defence.