...building in concentric rings with "up" placed at the center of the core would enable them to double the number of docking ports, make the docking pylons considerably more accessible and would allow all six pylons to have a "downhill" run for ore processing.
Direction of gravity isn't a factor in the internal arranging of the roughly spherical core, or the narrow inner ring. And for all we know, all six pylons indeed provide a "downhill" run towards the middle. Or towards the top, whichever works better. From "Crossfire", we know long vertical drops exist, and like you say, this may be because local sharp variations may be difficult to do. But it doesn't follow that a long vertical drop from bottom to top couldn't be arranged for a pylon that stands far apart from the other gravitated decks.
I'm talking about the movement of goods and products, by which time the Federation was using the facilities originally devoted to ore processing for merchant storage and scientific equipment.
I'm not sure they ever were. Merchant storage would have been an original Cardassian functionality, and there should have been plenty of overcapacity for managing the later Bajoran needs without modifying anything. In contrast, "Civil Defense" is the first time we hear of our heroes tampering with the original ore processors, and it also sounds like this is the first time they are doing so.
(Speaking of original functionalities, I'm pretty sure we can dismiss the Manual idea about the runabout docks being a Starfleet addition. Not only do we see them in the Terok Nor flashbacks (and Mirror universes), but their value to the occupation force would also be obvious...)
Sisko made a number of references to the ore chute (though which they later climbed) being full of "molten uridium" which flowed downhill into the ore processors from the freighters at the top of the pylon.
He says once that there was a flow from their original location to a secondary refining facility at "level 33"; he then said that "This is where the uridium ore was separated from the rock. Then it would be dumped down that chute to the processing facility.". The source of the ore (freighters, transporters, beanstalks?) was not mentioned as such.
But when our heroes finish their upward journey, they still have to get "up" to Ops...
FWIW, "Crossfire" shows our heroes boarding at level 2D on an upper pylon, and supposedly having to go past level 44 to reach the Promenade (that is, the horizontal passages thereto). So level 33 ought to be somewhere high up on a pylon, which doesn't fit with "Civil Defense".
But if we assume the lower pylons have reverse numbering schemes (and the letters, from A to F, perhaps denote the specific pylon), and our heroes were in the upper parts of a lower pylon in "Civil Defense", then things look a tad brighter. But that would still mean the ore came down either from the very top
or from the Docking Ring, leaving us with options rather than answers. Perhaps the ore arrived via loading bays or huge transporters in the habitat ring and traveled outward through the spokes?
OTOH, a slave who pockets a regular salary in the form of food, clothing, shelter and a small allowance doesn't cease to be a slave until his master can no longer claim undisputed control of that slave's life and property.
I'd think occupation would make every Bajoran citizen a slave in that respect - but everybody onboard Terok Nor who wasn't a comfort woman was in fact indicated to be either a privileged collaborator or (like Kira's alias) somebody who was free to come and go.
Timo Saloniemi