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I don't think LiFePO4 really benefits from shallow discharges. I think it's better to only go down to 20% instead of completely discharging it, but most batteries are that way. The new thing with Lithium batteries is only charging to 80%, which gives a pretty good increase in cycles, but I don't think LiFePO4 benefits from that as much. There's some that are of the mindset that extreme babying of batteries to increase the cycles you get out of them isn't really worth it, because the cycles most batteries will give are enough for years of use for most people. By then, the batteries will have also degraded due to time and new batteries will be better/cheaper.
I would probably only do 3 in parallel to save weight, provided the batteries can supply enough power with that many.
A reason I've read that people don't do plastic holders for the batteries is durability. They're fine for a stationary setup, but an ebike is a lot harder on materials.
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