I have been mucking about with a formation much like this. Have you tried the things I mentioned in the thread
"Creating Effective Tactics"
In my tactic I have been disappointed with several things with respect to the match engine:
1. The match engine AI almost always passes to a dot, which makes the attacking side of this formation very hard to enhance.
2. Defensively, I have found that taking off the farrows and putting a farrow on the MC to be far more effective. If you make the mentality of the ML/MR defensive to normal and you take off FWR, he holds his position and plays the ball to the wings.He does not venture too far forward and the defensive end holds up.The crucial challenge in this formation is to make the MC and the DMC work as a pair. Ideally you want either one of them to win the ball and the other to distibute it to the flanks.
If you drop the ML/MR to wingbacks the tactic fails, because then your mids drop too deep. You don't need to barrow them either.
Closing down instructions are very critical in this formation as well, there are several ways to approach this and I have already covered them in that thread.