theEd: For full diagnostic information, follow these instructions.

If you can screenshot the output here it may help.

sbiddle: The fact you're not getting higher sync speeds would indicate you're cabinetised and need moving back to a wholesale connection (you may need to pay more) or you're outside the cabinet coverage area and connected to the exchange, in which case you won't be able to do anything to improve the sync. 

Oubadah: If I change ISP to Telecom or Snap will put me on a Chorus circuit?

Oubadah: If I change ISP to Telecom or Snap will put me on a Chorus circuit?

Ragnor:
Have you looked into the quality of house wiring? A master filter may help cut out reflections from daisy chained phone jacks.

As a test I would borrow a mates modem or acquire a Dynalink RTA1320 or TL Link TD-8840 (non T version) which can often be purchased for peanuts on trademe and see what line rates you get with an alternative modem.