Boy, have I learned to actively hate the way momentum is implemented in this game.
I am playing the Argentine league atm. Full manual, ss, etc. Good news: few teams attack wide, so I haven't seen the good old cut in in a few matches.
Bad news: momentum is just as obvious. Today played the same away match around 20 times and could not win. Here's how it goes. The probability of the home team scoring with its first shot is maybe 2/3. They keep having the momentum until they score. Their players react faster, jump higher, are stronger. If I score first, it only gets worse. The home team had 19 shots on my goal in the first half in one match where I scored first.
When they go up, my team gets the momentum. Suddenly my (manual) passes start hitting the spot. My players react faster. I can actually change my style of play completely once the CPU is up, because I no longer need to fear interceptions. Then, if I tie the match, the momentum switches back to them again.
Like someone here said: maybe they've introduced this system as a way of creating "stories." But is this lame or what!