Even though you already have an agent I would still call one of the ones I mentioned early. They may have some more helpful advice for you.
Is your agent MARA registered? Who are you using?
Another option to consider is to get a quick
working holiday visa if you are under 30. That way you are able to work in
Australia and you might be fine as long as you can prove that you have the funds to buy a return ticket.
Other than that there's not much else I can say. Definitely, definitely ask on the forum or one of the agents.