Not sure..., now the game have a fail and if you put only 1 MC, is illegal too (I think, prove in a friendly because is illegal the MR-MC-ML... but with a AMC I'm not sure now..)

I use now the 4-3-1-2

DR-DC-DC-DL
----------------
---MCMCMC--
------AMC-----
--ST------ST--


and for me works... about defenses of 3, I always said that are not consistent... so thats why I prefeer 4 men in the 1st line.
But perfectly if you wanna prove, and if is not illegal, you can have 3 DC's with the DML +DMR and this 1-3-1 if is not illegal, can work, all depend of your players, and how well play the 5 man in defense and the 3 players AMC/L/R.
All is to prove