As others have said i would be really careful about moving interstate without the ex's permission. He has the power to drag you right back to QLD.
I personally have done what you want to. My ex has massive anger issues and is abusive. I left him in QLD and moved to NSW. Luckily for me he has not pursued anything in terms of family law. He doesn't really have the resources to do so though.
Would your ex be in a position to afford legal representation or be entitled to legal aid? If not you might be alright.
Would you be able to convince him to move to NSW and then leave him?