Are you regular guests for those properties?
And how long is the stay?
I tend to think that longer stays usually will get very basic room upgrades as its not "profitable" for the property to lock their suite from potential paid guests for long period of time.

And for my stays :
JW Marriott Singapore - 2 nights stay - first time at the property
Booked : Studio room (1 cat above basic room)
Received : Premier Marina Bay Suite (from SNA)

Sheraton Melbourne - 2 nights stay - first time
Booked : Superior room (1 cat above basic room)
Received : Executive Terrace Suite (from SNA)

Westin Sydney - 7 nights stays - first timer
Booked : Tower Superior (their base room)
Received : Tower Premium (1 category above basic room on Executive floor)

Future stays :
Sheraton Melbourne (again) - 12 nights stay
St Regis Singapore - 3 nights stay
RC Mega Kuningan Jakarta - 3 nights stay