The bags will be through-checked from QF to AA, on the same PNR, so no need to collect and re-check. A two-hour connection from domestic to international at SYD is quite do-able, so long as the incoming flight from ADL is not delayed by too much. According to EF, QF732 has been an average of 12 minutes late over the past two months.
On arrival in SYD Domestic, go straight to Gate 15 to catch the complimentary T-Bus service to the International Terminal. The bus runs about every 10-20 minutes and the journey is about 10 minutes. AA72 would start boarding at about 10.30am.
At least you are not advocating MCT of 60 minutes like some do (including QF). Also, at ADL check-in, QF will provide you with both boarding passes for ADL-SYD and SYD-LAX.
Edit: Should lounge access be a consideration, I would factor-in extra time.
. However, it is what it is