You are way over mpm on the outbound to Sydney.However, it's probably a published route from Calgary to Auckland, so you can do it with an open jaw.
I have pretty much the same itinerary from Vancouver, but was not allowed to take Auckland to Sydney (system won't allow you, you can try it out)
I have open jaw between Auckland and Sydney, booked online. Will be booking either something on Avios or just buying cash fare to Sydney one way
When I took that flight last year my midweek flight got downgraded to 763...ymmv