Glen it sounds to me that the CASA strategy is to wait you out. Delay, delay and delay. After all, there is a chance after the next election that there will be a new government that will know nothing about your case and all the ministerial letters and advice will be gone - locked up for twenty years as usual. All that will exist is the official file (held by CASA), Hansard and nothing else. There will be a new minister who is not bound by his predecessors actions.
This is why we ned an Australian aviation lobby group focussed on electoral politics.