I think generally the amount of goals scored has dropped suddenly, I'm still able to dominate games for the most part and I still create a lot of chance, its as though my team's ability to finish off moves has worsened suddenly. I've also noticed that opposition are able to perform much better against my team now than they were before.
EDIT:
Found a potential solution to the issue regarding number of goals scored. My team is completely adjusted the tactic thanks to using the 'teamwork' match preparation option. I've started setting the match preparation to 'attacking movement' and I'm already seeing improvement in the number of attacking moves my team creates per game. I'd imagine that setting the match preparation to the set piece option could result in a greater amount of goals from corners.