A worrying trend? Of all the NZ based teams that have played NSL/HAL, its always been the case.
Its a little bit more than a trend. The netballers can't crack it. The Warriors have had mixed success, the Breakers looked to have cracked it, Super 10/12/14/15/whatever.
In the cases above, those that are successful/have been successful on the road in Australia have had a distinct advantage over the ones that have not and its quite simple really:
The NZ teams had better players than the Australian teams. End of.
Think about the Warriors 2 finals appearances, the 1 win in 4 seasons of the netball comp, the Breakers. When they have won in Australia, that have invariably won the comp or gone close. Thats because they had better players than the Australian teams.