I've beaten a few AMC formation with 4-2-2-2 including the dreaded diamond, so it's not much abt having a DMC or not as having good defenders and MCs can cut out the supplies to the AMCs.

Anyway just keep in mind that having 5-6* players doesn't guarantee that they would fit a lot of formations - this from personal experience. I notice that you are at Season 8, I am at season 7. You may have more knowledge of the game, but this is just my opinion.

Good luck mate!