I think you may be overestimating the ability of the methods cohort. Last year, apart from the last question, I would say the exam was about the same level as this year, possibly with MC this year being even harder than last. Yet, the A+ cutoff was 61.5/80 I believe... Your school must be very strong for everyone in the top 20 to get 77+, I believe my school is about the same, but not so for the general state.
I mean, i'd be considerably happier if you were correct (who wouldn't be xD), but when you're looking for a 45+ score, it's the top 2% of the state, so the cutoff for that would be substantially higher than an A+ (11% of the state).
Given that the top 2% is often separated by a careless mistake, I think that's why it's assumed that the exam didn't do too much to separate students (unlike last year where the last question was a legitimate separator).