Hi David
Have you allowed for your magnetic declination ? This must be done before you polar align.
There is info on the forum so just type into search - Magnetic Deviation or Magnetic Declination
The Magnetic Declination ( Deviation )for Sydney is around 12deg East of Magnetic South.
You can get your precise Magnetic Declination of your location on this link
http://www.ngdc.noaa.gov/seg/geomag/declination.shtml
You then click on
Compute your declination .... Then
highlight S & E in the circles ..... Enter your
Latitude and Longitude
Once you have your Magnetic Declination you point your tripod and mount to magnetic south then deviate it to the degrees calculated east of magnetic south.
Hope this makes sense
Barb