CHC-SYD-MEL should net 135 SC flex J or 120 for a saver/sale J. Since you need 95, no need for flex.
QF won't budge on the 28 Feb so you need to fly at least the one way before the end of Feb to get the SC's to take you over the 700.
If you fly the return in march and get another (for example) 120 SC, they will then count for your next year qualification (re-qual) for Gold, which you only need 600 for, so you're >20% there.