yes u have decided a better formation.As it is a must win for u i will suggest to use hard tackling..through the middle,OWN HALF(if u use attacking mentality and hard tackle)..and must use zonal marking..
U can use Red arrow on ur ST,so that the chances of scoring from corner should be increased..
And i will suggest to use one of ur Mc's in the middle with blue arrow,so that his only MC would be marked too..
All of these were just suggestions..Do what u think that is better for u
by the way best of luck..