Lots of good advice already in the previous replies. But I'd especially second glennaa11's point about your maybe hopping around too much. And I'd take it a step further and suggest that if you do cut back, consider getting out of the cities to check out other destinations in these countries.

Of the cities you've listed, I'd cut out KUL and PNH unless you're going to explore a bit more in Malaysia and Cambodia. I'd leave in HKG, BKK and SIN, but then again I haven't yet been to TPE and SGN.

You're smart to think in terms of CX business class transpacific, as it's great. But I'd suggest you serious consider cashing in your AA miles to fly at least one-way CX in first class, as that's really a special experience and doesn't cost much more mileage-wise than business. And if you can modestly increase either your AA or UR (for BA Avios) balances, perhaps you could fly CX F both ways. I'm not certain, but my impression is also that CX F sometimes has more award availability than CX business, so that might be yet another consideration.