Chopperpug, have a look here:
http://www.afap.org.au/files/AV8BANS...0GA%20AFAP.pdf
Sorry mate. Your boss is doing you no favours at all. Have a good read of the award. This is the bare minimum you should be getting paid.
As you said, your boss is charging you out at a high rate, what's the excuse for not paying you a fair wage?