A comment on that, item ducts work putting into barrels (from the top only) but with your set-up there, the hoppers are redundant unless you're wanting a buffer at each barrel. (it may also speed things up a bit compared to regular item ducts but just letting you know if you want to save some resources)
I am buffering at each barrel. The hoppers increase the speed at which the barrels operate. Using an item duct directly, will only allow a stack size of 1 to be sent to the barrel. If I use hoppers on top, I can send up to a stack of 64 per item duct pulse. This greatly speeds up the filling of the barrels. I use a round-robin output with about 8-16 per stack. This helps even out the use of each barrel and increases the throughput significantly.
Resources aren't too much of a problem, although I am getting a bit low on iron and redstone. I've had my sifters turned off while I tweak my item storage, hammering and smelting of ores.
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