The only people against whom you would have any possible claim are CX since, if I understand you correctly, they made a misjudgement and cancelled your First Class reservations on the flight you actually took thinking that you would be unable to make the connection. If you actually arrived at SFO with less than the official MCT then your case is quite weak I would say.

Presumably CX offered you a hotel for the night and a First Class seat the following day, but you chose to decline that in favour of travelling the same day in Y.

That's a voluntary downgrade and no compensation could be forced. As a matter of goodwill, since someone in CX clearly made an error of judgement in releasing and rebooking your flight then I think a polite letter to CX might get some form of compensation, but I doubt whether it would be in any form other than vouchers of some sort (upgrade or inflight duty free spend are the usual ones). If you are crediting your flights to AAdvantage then I think you're getting Economy miles and there's more or less zero chance of that changing.

Having said all that, this is one of the annoying consequences of American Airlines giving out free upgrades to all and sundry so that the F cabin almost always flies full. If you turn up after the point at which they have allocated those upgrades you are stuffed.