Narrow/Attacking 3-3-1-3

[Tornado88]

Got a cup game later in which I lost the first leg to an inactive one level above me, anyway ..he plays an attacking 3-3-1-3 and I need advice as I've never played against this formation before and my 4-5-1V didn't do too well against it in the first leg!

------GK------
DR--DC--DL
-----------------
-MC-MC-MC-
-----AMC----
-ST-ST-ST-

I can see that it is vulnerable down the wings and that is how I attacked, with success because I put two past him, but I just couldn't defend against all his attacks and he outscored me!