Jond that looks like a well sorted out storage, especially for a NSW person!
What volume is each bag, and what to you put in each bag?
Do you have a water bladder in/on the brain Box?
Lol in the Bachetta brain box $100 Australian I carry a water bladder in the insulated vertical carrier inside brain box. It’s a 1;5 litre job fits well. Any bigger ( taller) would need to be carried outside insulation sleeve in main part of bag.
I carry food clothing phones etc in rest of bag plus 200 south Australian male human brains.
The orange frame bag bike bag dude $50 contains energy bars gels and pedalpower sic electronic charger. I can squish a Sanger in there too.
The two medium size saddle bags turned side on contain my O2 gorewear shell jacket and puncture repair kit gloves multi tool links gear cable two tubes etc
Sweat affects the zippers on the saddle bags so must be waxed routinely to prevent seizing.
I use a lanyard on the vendetta and magnets on hurricane for siting drinking hose.
I could never safely get the knack of pulling Bidons from behind my head.
Under the seat I carry topeak mini track pump and aerolab aero bottle which I can reach for electrolyte replacement.
Gosh sounds heavy till you realise south Aussie brains are all hydrogen sometimes helium. But always medicated with lithium.
Volume of bags is good enough for multiday audax in cold rain. See Bachetta site.
Touring self supported just add banana racers.
I prefer Bachetta brain bag to radical design bag which I also have as it’s a tad smaller but more practical. The radical bag though like their racer panniers which also fit on vendetta fine as you saw are higher quality and you pay for it.
In addition it’s a good mudguard and has not filled with water in rain though i am a fair weather blessed nsw rider.
One year on with brain bag I highly recommend.
Nb as you saw touring is possible with vendetta but is unweildy with front end of bike affected by weight but I was on a mission.
My touring rig is a greenspeed gto with a nice pannier set up includes banana racers red of course .