Ehh...to wit:

* You can take the 747 going back to GUM, as the 6:00 pm HKG-MNL flight is on a 747.
* No, PAL does not steal luggage, and I've never had anything stolen from my luggage on any airline (PR included) I've flown out of MNL.
* If you board a newer A320 (RP-C86xx onward, though this range is for the A319 and the A320), the C seats have PTVs. These seats are Recaro seats. Not sure about service though: as a general rule, if Y service is great, C service should be better.
* The Mabuhay Lounge in MNL, from what I've heard, is okay, though don't expect too much, like the presence of showers. The food though should be great: do try PAL's famous arroz caldo (chicken porridge).