though now that CASA keep the date of the anciliary checks like audiogram and stress ecg etc a close secret it is difficult to know what needs to be done until they tell you.
What a load of complete rubbish.
The requirements for things like that are clearly on the CASA website.
Civil Aviation Safety Authority - DAME Reference Chart
Your DAME is supposed to calculate your Cardiac Risk Index (CRI) at the time of your medical, and the ones that are on the ball will refer you for a stress ECG at that time. If he/she doesn't, and it waits until CASA reminds them, of course it will delay your medical. Same goes for the age-related requirements. If your DAME doesn't keep up with the requirements, find another one.