My situation: 30 adults (popcap), 6 full-time military, effectively all industries set up. Long vertical distances on the map. Magma workshops at 120 z levels below agriculture. Low resources (neither iron ore nor cassiterite on embark or even in my civ - in a pocket world), but sand and normal clay at soil level. Feeder stockpiles are almost always close to workshops. I partly use quantum stockpiles, mainly around the forges and for masonry. So far this has worked fine (no hauling of metal bar bins to pick up traded metal bars, easier linking of stockpiles etc.). Tried to specialize hauling labors, but did not get very far (only basic things like woodcutter does not haul wood).
My problem: Several items are used in multiple places (empty bags for dye quern, food quern, sand collection, potash at kiln and to fertilize) or require long hauls (sand/clay collections) - making a subsidiary workshop close to the collection zone (I did) kills the manager for the industry in question and still leaves me with hauling filled sandbags / clay down 120 z levels and empty bags back up again 120 z levels. I could move agriculture to the caverns just a little above magma, but the soil there is peat not sand/clay, so no help for the industries.
Short of building a powered minecart system, what can I do to optimize my hauling? Especially for the nightmare industries (glass, pottery).