You've definitely gone above and beyond the requirements of a HSC English student. Those are concepts that I never really understood in my essays, and I merely paid lip-service to them, and still almost wound up with a state rank.
Only thing I would add is the commercialisation in the 80s, as reflected in BR: 'commerce is our goal'. The 80s were when people began realising that human and corporate greed may come back to bite us in the ass (especially events such as the '73 OPEC embargo) etc etc.