Agree with Triadic, the Aero Commander 500S, aka Shrike, has a long history of service in the Straits. Assymetric performance on FAA data is good, not so good at the higher CASA approved MTOW increase. Badu (YBAU) has a 920 mtr sealed runway, definitely not limiting.
When flown accurately by a properly trained pilot, operations into much shorter strips is par for the course.
The Shrike has a simple fuel system, both engines feed off a central fuselage tank fed by wing tanks, so fuel selection is ruled out.
The aircraft had not reached blue line, Vyse, but Vxse still yields climb.
Earlier threads on the operator suggested they didn't want experienced pilots, rather employ fresh pilots and train them their way.
Hopefully ATSB might investigate if their budget allows, and provide some answers.