Thanks Trevor and Rusty, I'll definitely give it a go!
Doorway you do raise a good point about other animals stomping and this is definitely something I consider with my experience.
Though whatever stomped at me did so in a very deliberate way as each stomp sounded identical and they were evenly spaced apart.
Since the sounds originated from the same place the source must have been standing still (possibly ruling out a roo) which suggests perhaps a Samba Deer (they get to the size of cows) or something else which can stomp loudly without moving. Plus whatever it was didn't run away or make any sound at all before or after stomping, not even to snap a twig or crunch a leaf which i'd expect of a roo or deer.
I doubt I'll know for certain what it was unless it happens again, here's hoping
Rusty in your experience what kind of stomping have you had? Is there a common pattern to it?
Also, do Yowies stick sticks (only about 1-1.5 metres long) into the ground? During several bush walks I've come across dead sticks standing upright out of the ground. They are always up to 2 inches deep, hardly ever have attached leaves or branches and largely appear to just have speared the ground after falling from the trees. Yet some are hardly aerodynamic enough for this, seem too small for the momentum required or are at a distance from the surrounding trees. Plus I've only seen them during the warmer months, once we hit winter there is nothing to be seen at all.
Absence of evidence is not evidence of absence.