Sorry for taking some time to get back to you. I am glad Bob jumped in with a suggestion.
You seem to have come quite far on your own. Keep up the good work! If you are as far as Strike the Tiger, you are much more than half way there in terms of new movements.
I love our Association, I love our form, and I love our teachers; however, that does not mean that other folks are not doing wonderful Tai Chi. If you are not particularly devoted to our version, I think there are others teaching in Australia that are worth checking out.
If for whatever reason Bob's suggestion does not match what you are looking for, you might also want to check out schools affiliated with Fu Shengyuan and his family.
His form and curriculum seems quite close to ours from what I have heard by reputation and what I see in Internet videos. From the map I have linked to, it seems they have schools on both coasts of Australia.
If you would like to stay with our version of the form, you might want to establish a long-distance relationship with one of the centers or teachers that could help guide you in your practice. Learning the form fairly well without a teacher nearby can be very difficult for most people. I do know of a few that have done so through videos and more that have done so through occasional travel to a far-off school. I suppose you could even workout a way for someone to review videos of yourself that you could send.
As for resources, I would highly recommend the Yang Family Tai Chi Chuan Traditional Form
DVD sold here
on this site. It provides good instruction in English as well as many viewing angles. It is technologically a step beyond the old video that has been duped in some places on the Internet.
You can also join the association and get the newsletter and, of course, ask questions on this site about form or other questions.
I hope you find this helpful.