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If I'm understanding correctly, your joists are level and the slope is created by the cross boards on top?? If so, then I'd definitely do the solid wire hanger. Chain hanging is allowed by codes so, I wouldn't sweat the S hooks on a wire hanger. Even with sloping sheathing, I'd still do chain vs the between board stringers.
If the wiring is protected as it appears then the TYPC MC can still be used. SOOW is overkill IMO and then the armored would take care of any movement issues you might have. It'll also be easier to route and install. Also, you mentioned liquidtight conduit?? Is that feeder to the J-boxes? You should not run any bundled cable within conduit. Only individual circuit wires.
If the height wasn't an issue, I'd be screwing the fixtures directly onto the joists cross ways instead of parallel between the joists but, I understand you wanting to maximize the overhead clearance.
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Harmlessly passing gas in the grassland away;
Only dimly aware of a certain smell in the air
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