Welcome to AFF
pleasureg
There are the usual suggestions to keep looking, try alternate routings (eg via Auckland, or Hawaii), be flexible on dates and routes (midweek is best), be flexible on whether you need to travel on the exact same flights (if more than one of you), etc.
It may be a bit late for this time, but since QFF allows one-way awards one good strategy for those who know their travel dates is to book each bit between stopovers as soon as it becomes available (at 355 days before departure).