It seems rather strange - there is currently demand for experienced flyers in Australia - I know all 3 majors have a strong interest in recruiting experienced flyers as they are easier to promote quickly - JQI is even recruiting experienced flyers as direct entry Cabin Managers & CSM's.
I'd look at your interview skills - for example previous flyers I've interviewed in the past (especially from EK) tend to think they'll get the job just because they've flown before - they also need to demostrate the behaviours the airline desires to be competitive at scoring time.
See if you can find someone with interviewing experience to give you some coaching regarding group & behavioural interviews - it may help on your next application.
Keep applying though - I can't imagine there's an airline in Aus who wouldn't want a experienced flyer who has a good name if they come acorss well in the interview.
Good luck!