johnnyk, I looked up your flight which is if I'm not mistaken PR1818. On FlightStats' website, it shows an 'average delay' of 65 minutes with the flight being on time (defined as 15 minutes or less late at destination) less than 10 per cent of the time. There is quite a large standard deviation shown and hence there is some chance that the delay may be worse than 65 minutes. Not a good picture.
Unfortunately at MNL delays tend to increase during the day and early evening. However Sunday evenings may not be quite as busy as a weekday, but having said that, you're subject to how the incoming flight (presumably from MNL) operates and that is probably departing MNL for DVO at around 1430 - 1500 in the mid afternoon when it can be quite busy.
A good rule at some such congested airports in the tropics is to try to travel earlier in the day (departing at say 0700, 0800 or 0900 at the latest) as delays tend to be less, subject as always to weather and other uncontrollables.
Thankfully you have HLO but even that is risky given the 45 minute cutoff time as discussed above. I will be saying a small prayer for you to St Anthony!
Next time, allow at least four hours for such connections, although five is better. It isn't much fun being bored at airports but it's preferable to missing a flight.
Your Plan B could include a cheapie hotel in say Makati, but allow plenty of time to get to the airport in the morning on Monday if you do that. If your budget allows it there are some hotels opposite Terminal 3, the cheapest of which is a newbie starting with B (although it's not Hanoi-style 'cheap', as its room rate may be A$120 or so). Nonetheless that's a lot below Crowne Plaza Changi Airport. These ones would cut down on travelling time to and from the airport.