What should I do?

[Satwe]

well... you should get some as soon as possible :P
the Midfield is the most important part of your formation so you should have at least 2 in each midfield position
in that case the only formation i would try is either 5-3-1 or keep this formation you have already... and you watch the game.. if you see its going well then keep it this way.. else try to play with the dmc or try some amc as well... and wish for luck :P

edit: im sorry i mean 5-1-3-1 ST

MC-MC-MC
DMC
DL-DC-DC-DC-DR