Thanks everyone. All the suites suddenly got swept up at the PH (it's actually very near from now) - I'm not sure if they were really all bought out or what, but unlikely we can get further upgraded even if we booked yet another night. Not that I should be expecting it anyway and hopefully 3 nights won't be too short to make the most out of the hotel and the suites we're booked into
Ended up booking the GH. I figure the $300 savings vs PH can buy us a nice Michelin meal and some taxi rides instead. Unfortunately they didn't offer any 9000-pt upgrades/'premium suites' for redemptions (as in, there are none categorized for this apparently) but no complaints for getting the 100 sqm Grand Exec King suite as a standard suite upgrade despite not the preferred bed type