I used to be on Telstra PDQ and my modem status page indicated it was connected in ADSL2+ mode.
It probably depends on the equipment in your exchange, it's possible (but very unlikely) if you were on Orcon+ that Orcon has ADSL2+ gear in the exchange and Telecom hasn't upgraded that particular exchange to ADSL2+ gear. However I thought Telecom had already upgraded every exchange to ADSL2+, I might be wrong though.
Were you on Orcon+ plan? What make and model of modem do you have? What is the modem's adsl status page(s) showing?
There is not really a "standard adsl" speed, the rates you'll see on your modem screen get largely determined by some of those other stats you've listed (eg: downstream margin and attenuation).
It's typically acknowledged that Orcon have chosen more aggressive settings than Telecom for their equipment, but the difference shouldn't be too large.
Also higher sync speed does not always correspond to better real world throughput in KB/s, especially to international sites. Real performance is often limted by the ISP's traffic management and available bandwidth.