Going along with hurricandave's suggestion of custom usb cables. I'm working on version 2 now, going straight to the jack this time. I hope I can cut down the power usage a little.
https://i.imgur.com/yX0uaBf.jpgSo you're running the beefy (24ga?) wires from power supply to the two outer posts on the USB connector and then the two inner data wires to the USB hub? Do the male plugs that go to the USB hub only have data +/- connected, do are you doing something with the 5v from that bus, too?
Would you mind providing a closer image of where the female ports connect to the wood supports?
I like this idea and may "borrow" it if that's okay with you...
Those are 18ga power wires on the outside and 28ga data inside.
I don't make them anymore. I make "upgraded" usb cables now.
They were too difficult to make and assemble and I didn't trust them.
I tested 10x patched cables against 10x homemade ends they didn't make much difference.
So now I just "upgrade" usb cables by cutting the power from the hub side, solder in 18awg wire powered from the meanwell.
and stick em in a plastic holder
https://i.imgur.com/2MCQ7VM.jpgI made a post in the "I did it" thread with more info. The only real difference is I now cut the both power wires coming from the hub.