It doesn't matter what the limits are in the USAF flight manual, if you are civil licenced. You are required to follow the type certificate data sheet. Data sheet A6CE has this:
C.G. Range (Landing (+137.5) to (+143.3) at 4300 lb.
Gear Extended) (+136.0) to (+143.3) at 3600 lb. or less
Straight line variation between points given
Landing gear retraction moment is +3318 in.-lb.
Empty Wt. C.G. Range None
*Maximum Weight 4300 lb.
No. of Seats 4 standard (2 at +102, 2 at +141), 5-6 optional (1-2 at +170)
Maximum Baggage 365 lb. (Reference weight and balance for additional information)
Your maximum weight is 4300 lbs.
The USAF flight manual lists all weight in excess of 4400lbs must be jettisonable, which means loaded on the wing pylons, and each pylon is limited to 350 lbs.
I don't know if the civil aviation authorities in Australia follow the USA FAA TCDS's.