I can't offer much advice, medicus, except on two minor points.

First, the change to QF earning on AA flights is due to the US DOT not being happy about the AA/QF joint venture. If the DOT changes its mind I would expect the earn rates to go back to where they are today.

Second, with respect to the LAX-MIA, as you noted, a handful of flights are operated by a three class aircraft in which case you should earn at the First rate. The change to earnings on 11 January reflects 99% of AA domestic flights where only two cabins - First and Economy - are offered. This is the reason for the lower earning. The Qantas website contains a myriad of caveats and exclusions and you've encountered one. However, I'm confident that this is simply an oversight on QF who simply hasn't been able to keep up with all their footnotes. It's a three class flight so you should earn at the F rate. Nonetheless, I would still get it in writing from QF by emailing them. Be sure to explain it's a three class flight in the event you get someone in Manila (apparently QF's call centre is being outsourced so who knows who might receive your email).