By drilling F3 and slipping the production date there is a chance that the price of oil will drop as the US and the rest of the Northern hemisphere exits winter. Also first cash flow for the project seems to be 1 month after the production date. So we are looking at April before the cash flows.
The AUDvsUSD is currently at 80.7c up from 75c on the 8th of December 2017. As the Australian dollar strengthens the project becomes less lucrative. In Australian eyes.