Meaning no disrespect I don't get the folk who pack tents in panniers. It seems a waste of important real estate to me. My tent is often wet/muddy/sandy.
If you're new to touring I think a left/right balance is important, not so much for riding but for stopping and parking. Too easy for an unbalanced bike to fall over.
Organising clothing by coloured bag is a good idea, depending on how much you're carrying. It's easy to grab one bag and head for the shower knowing it has everything you need.
First aid kit should always be accessible. Blood stains, you know
And rain/cold weather gear.
Some bungees don't use hooks and I've had no problems with them. Useful things. As well as a clothesline one is currently holding my trousers up as a belt. My waist is the smallest it's been in a couple of decades😊
Trangias are great! Not the fastest but a great way to cook. Some small containers with sauces and condiments can really spice up a simple meal. Lots of places to stop along the way where you're going to brew up a coffee or tea too. Pack an extra cup and make new friends!
Some of those ultralight sleeping pads can make a racket! If possible try one out before buying.
At the end of the day we're all different and carry and pack differently. There's no one best way. Finding out what works is all part of the fun.
Have a great trip!