I want to pointed out, why we're usually 'struggling' against mid table teams, but having a great record against big clubs in an away matches. The answer is, we play 433 formation against big ones, while we play 4231 formation almost every times against the rest away. Yes, it seems worked against Everton this season, but that is 'very rare' to happen imo. Now the real question is, why we're not playing 433 formation in every away matches, regardless they are big clubs or not? We have the resources, I don't see why we couldn't do that.