I'm sorry the tester would not give you the subtest scores. I find that quite odd. You are right to seek out help from the GT community, I'm sorry that you don't find strong support where you are in Australia. I don't know much about GT education in Australia, except what I have read about Terrence Tao. It seems disapointing to me that a child's educational needs could by stymied by politics, but it is so to an extent in all countries, I suppose.
I don't know if this will help you, but here goes:

http://www.neopsychology.com.au/ourTeam.php

specifically, Jodie Valpied. I don't know if this group is within a reasonable distance. I also have no personal knowlege, just have a good feeling from what I have read.

Good luck and I hope you figure out what is going on for your son. It certainly warrants further investigation.

Neato