Nice looking list! I'd be keen to see how the Hogback works out. Our Megalight is starting to come to the end of it's useful life (12 years later) so I may be looking for a new tent. Over all your weight looks excellent.
I'm going to disagree with Roger on the snake bandages though. Being bitten is very low risk, although kids probably raise the risk a little. A bandage is one thing that I find impossible to improvise, and I don't want to be there looking at two puncture holes in someones calf and wondering if it's a dry bite. However those 7.5cm crepes you are carrying really are useless. Try wrapping a limb with them, and see how you go. On a pretty skinny adult, I reckon you'll make it almost to the knee, and they will come loose after about 20-25 minutes. I like the Setopress 10cm bandage from Independence Australia. They're almost $20 each including postage, and you need two to reach from toe to groin of an adult, but they're printed to show how tight to wrap, and how to overlay for effective control, and the velour finish doesn't come undone. You can also use them for a sprain or wound. Two of these, a couple of bandaids, a 50ml saline vial, a 10g needle, a 3mm drill bit and a small roll of sports tape make up my entire first aid kit.
I disagree with Roger on the cooking too. If your kids are big enough to help with the cooking, they're big enough to do it all!! Take one pot, and one stove. I have a GREAT 3L pot from someones Grandma's kitchen. Very thin aluminium, with a flashing lid that weighs under 300g. I paid $3.50 at a charity shop. It's big enough to cook for all of us, and makes a great washup dish at the end. We do carry a light weight 1L ali pot as well, which blows our weight out a bit. You wouldn't need it for FBC though.
A pot this big does prefer a remote canister stove though. Roger, I've retired the Chinese one you helped out on. It did eight days through Tassie for the four of us, but I admit, I took my Snowpeak as backup, since I didn't trust it. I've bought a Primus Spider to replace it. This is heavier than even two of your Litemaxes, but you only need one cylinder, so overall a better option. Stability can't be matched by a screw on stove
For plates we use the Decore 800ml round containers, the clear ones, not the red. These also work well for rehydrating food, with a lid on, and tucked into the sleeping bag. Plus they either stack, or can be used for storing food, such as tomatoes etc. It's also much easier to shake up a couple of sachets of iced tea or powdered milk in one of these, than a Gatorade bottle.
If you're looking for another knife, I love the Vitorinox Tomato knives. Kitchen shop, not camping. They don't fold, have a rounded end for getting the peanut butter or avacado out, are serated, and sharp enough to cut anything, including straight through a thumbnail into the flesh underneath. (Not mine.......see bandaids above)
I wouldn't normally carry a rubbish bag, and just use the zip bag from the first packet of flat bread we eat for lunch on day one. These are much tougher plastic than the ziplocs too, which always seem to tear on anything even remotely sharp. FWIW I find the Wattle Valley breads hold up the best after 2-3 days in the pack.
Let us know how you go. It's always great to see other Aussies, and other families out there.