When impulse first started flying for qantaslink there were problems with offloads of freight and bags this was as ditzy boy said only a paperwork issue and once the MLW was raised (as well as the BRW slightly) that solved the problem and there are now usually only offloads of freight when there are extreme numbers of bags (by that i mean above 190 bags on a flight)
and the offload is more likely due to volume than weight.
In addition to that We also have 6 HGW B717 which are never limited by weight and have an available payload which is notably higher than that of a B7373.
EWL,
We are still taking a S*#tload of Seafood out of Tassie each day
so maybe what you were referring to was when we first started with qlink.