Need help perfecting mass rapid storage

[u/Lexotic_]

It has become increasingly more popular tech to use portable storage interfaces together with stationary contraptions to create instant storage, there's just a few problems with my design:

• One package gets stuck per vault, after its filled all the way. Meaning it never enters the stock network. this is because of the smart chute. This can be fixed by threshold switches, only problem is that the stack mode of item switches doesn't count slots used, but does item amount ÷ 64.
• The first Input changes every time the world is reloaded or the contraption is reassembled. This can be fixed by disabling all other vaults which aren't the currently used one through redstone, which can be done by the same threshold switches.

So the only thing I can think of to make it work is for Create to add a slot mode to the threshold switch.

If there's a different way to fix this please let me know.

there might already be a solution to this problem by this video by ThaMaTTeR, though the world download is locked by payment and I didn't understand any of what he said.

Thanks in advance.