Your methodology is not HFT.
I was aiming at these guys. They have the game rigged from all angles.
Their proximity to the servers allows them to not only snap up arbitrage, but to see orders coming in before they are viewed by others which in turn allows them to manipulate the movements of Equities/Derivatives at their disposal to take advantage of orders coming in.
ASX/ASIC call it liquidity.
I call it theft.