I hope you are flying around on the A330 at the moment coz if you are then you really don't know your airplane. The A330 has done MNL & PVG.
I do not think Gf has ever (and I am pretty sure of this) flown the A330s to MNL. 2 things according to my info:
1) Even if the A330-200 is able to make it to MNL, I will bet anything it will be payload restricted.
2) The A330-300 has a much shorter range than the -200. So if the -200 can barely make it, rest assured the -300 will never be able to make it.