I've been saying this for some time. For me, the changes to this system to make it work on a consistent basis are pretty obvious. The team just needs more structure. The midfield *diamond* needs flipping the opposite way around to how it is, with Kulu at the tip of two deeper lying midfielders rather than two floating attacking midfielders being in front of a single pivot. Unless you're going to put a Rodri level DM in that single pivot it's just going to be too open and we will give up lots of good chances for all our good play.
Similarly to Poch's system, one of the deeper lying mids should drop in when we are in position to allow the full backs to push into midfield.
We also look far better from an attacking POV with a proper winger on the left. Son doesn't suit Ange's system and we always look better with Werner out there for me. There, i said it.
Son out and the diamond flipped would I think improve the overall performance, although I maintain that I think a 3-5-2 would suit this squad far better overall.
If Ange persists with playing the way he is, he's sacking himself I'm afraid.