Managed to get in just over $500 of spend on QF about an hour before the deadline:
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The $1.29 x2 and $2.58 are carbon offset payments, the $5 is a preferred seat fee, the $44.51 is tax on an award redemption (MEL-ADL), the $176.60 is a cash fare (MEL-ADL) and the $272.40 is 2 cash fares ADL-MEL.
Mrs MN and I need to be in ADL next March so this offer was perfect timing to try out QF for their short hop service (and after the $75 credit this was the cheapest option across all carriers JQ/VA/ZL).
How did I do? Hopefully the AmEx system adds everything up properly, sees that it's >$500 and applies the $75 statement credit as promised.
Let's see how it all goes in a couple of days (weeks?) after everything comes out in the wash. Wish me luck guys!