If that's the case, I don't think you should rule out either. At the start of year 12 (with my school's recent performance and my own disappointing performance in the year 12 subject I did in year 11), I thought the best I could do was RMIT (~75). Even though that was a realistic expectation, I set my sights higher, for Monash (the numbers you see in my sig, which I'll need to change eventually). Come December, I was quite pleased, and barring a 4-5 point increase, I should get an offer from them.
If I can get a decent score, anybody can (though I guess most of it was due to good scaling). What subjects are you doing this year?
Also:
BCom Deakin: 80.25
BBus Monash: 82.50
Not that much of a stretch, though I guess we'll have more recent information whenever they release this year's guide.