I generally play with super aggressive formations in CM when starting off with out-manned teams in lower divisions. However once I get into the top flight I generally roll with old faithful. The other thing I am getting better at is forcing CPU defenders into bad angles and being able to hit through balls accordingly on the break. Something that works to perfection with this formation.
^ totally agree with this. When I play this formation, it definitely feels like the game plays much more open. I think the 4-2-3-1 is great if you're trying to find open space on the pitch and play into the gaps. With your LAM/RAM, they're good at keeping the field playing wide and it allows you to swing the ball around and have what feels like acres of space to roam around in.