Lol, I got around the same ATAR: 89.25
I only got one band 6 though, band 5s and a band 4 (lol 79 - 1 mark off a band 5).
Although my subjects were mostly scaled fairly high: EngAd, Bio, JapContinuers, Studies of Religion 2 unit and Anicent History.
I also used one of those ATAR calculators and 2 marks in the right subject would of gotten me a 90 but I'm pretty content with my ATAR as I can get into uni which was my main goal. It sounds like you worked hard and you didn't miss your aim by a mile so I wouldn't be disappointed by those marks or ATAR.
I agree with what someone said about the language subjects, those can be pretty competitive and maybe maths brought you down...