Your wishes don't change reality. As per IR, Philippines will balance China with the US. Even if Philippines wasn't a US vassal, it would still balance China by bringing US help.
Its basic geopolitics, no country wants a powerful neighbour.
Mexico relations with the US is also easily explainable. US has such an overwhelmingly stronger military that Mexico really has no choice than to accept the US status as a well deserved regional (and global) hegemon
For China to break out of the ASEAN balancing games, it needs a similar overwhelming military power that would make ASEAN shake on their boots by just hearing the word "PLA". That's the degree of terror Mexico feels towards the US military and that's the military development that China is undergoing now (even with such a low military spending per gdp)
AMLO slaps the US on a daily basis hard nowadays though to be honest.
The only reason you don't see AMLO doing exercises or keeping Chinese bases there like you have the US in the Philippines is that China doesn't have that capability yet. If China had it, it would happen, no question.
Also, it is true that the US has the strongest global military force in the world, but its weakness is also that its "global".
Mexico probably doesn't fear them so hard, because they know that the US isn't stupid to waste any time or resources on them when they have to keep Iran, China, and Russia, which are way more important for their hegemony, hence two and a half other continents effectively in check.
You are, therefore, overestimating how much Mexico fears the US.
Yes, they fear them, but not like they did 30 years for example.
Nowadays more and more US forces and focus are on Russia, China, Iran, etc...