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no, thats all good info!
I've watched a few videos but like you say, mostly focused on racing, wouldnt mind a few luxuries. The video you posted seems good.
Tent is a Terra Nova Zephyros, I guess a laser would be an upgrade but not sure how big the difference is, pack size wise.
apc-
Find it boring that so much bike packing information is focused on what sponsored riders are packing in their ultra rides when there's obviously loads of people using the gear who just don't want to put a rack onto their bike because they normally use it for something else.
That tent seems fine, maybe you can get a smaller bag? I'm assuming you're quite a small person so maybe...?
Some sideways thinking, but if you're carrying food, but have decent resupply you could take a packable backpack (decathlon have them cheap) for the distance between resupply and camp.
If you're amenable to spending money there's also that tailfin rear rack thing. It looks a bit funny but apparently is well engineered and is very easily removable.
Alternatively find some giant with a 62 inch frame and loads of seat post and get them to come with and carry everything...
Belagerent
Arm chair thoughts so apologise if I'm teaching you how to suck eggs.
You could get a snack bag that goes on the front roll, stem bag or a fuel tank style bag for a bit of extra capacity but it probably won't go beyond snacks and gadgets.
You don't mention what tent, mat and bag you have. Could be good potential for an upgrade maybe. Moving the tent poles to the frame is definitely the way to go though.
Another alternative would be something like a Carradice style saddle bag, you can get pretty spacious ones. They might need a bag support but they attach and detach pretty easily (one bolt).
Bike packing dot com have kit lists and tend to specify how they've packed things, could help though they are mostly for "endurance racers".
https://bikepacking.com/plan/gear-lists.
There's also many " how I've packed" type videos on YouTube you could look at. I like this one https://youtu.be/qIbF8h_IBzM
because it seems pretty down to earth, UK centric and budget friendly.