I couldn't get sync at all initially and that turned out to be some poorly done wiring on the incoming side of the splitter. Once that was remedied it would sync, but only with the modem (NetComm NB604N) set to ADSL2. If I enabled ADSL2+ it would not sync. Just to be sure it wasn't the house wiring I disconnected the house entirely and connected the modem directly to the incoming pair.
Here are my connection stats:

Apparently I'm pretty close to the cabinet:

I get download speeds of 2-3 Mbit/s, Ookla is:

So where to from here?
- put up with it?
- moan to ISP?
- moan to Chorus?
Thanks for reading this far,
R