After isolating the usual suspects (line problems, modem problems), my attenuation downstream for PLDT DSL is still 60+.
The polarity of my wall jack is wrong (I replaced it before because it got borked, my bad). Pin 2 should be positive.
Corrected the polarity of the wires. Now my attenuation downstream is 55: still low, but at least now my DL speed goes beyond 200KBps. May have to contact PLDT later.