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I mostly enjoy the challenge of doing something useful with the meagre resources you find in any given cache, so the ones on that sub which show the same improv spirit appeal most to me. Many of the caches in the Depths, foe example, have a wing but no obvious way to get it off the ground. That said, despite having only done one mini boss (the one above Rito), I've explored most of the Depths and just fully populated the cells on my charger belt accessory thing, so maybe it time to experiment a bit more.
itsbruce-
Have you FULLY populated them? I.e. not just the first 8, but the second 8 (so they're blue rather than green)?
And a way to get the fan off the ground - lift it into the air with ultrahand (those zonai engineering stashes are usually on raised platforms which helps). Then lower it towards you. Recall. Hop on as it carries you up and you float on your merry way. You can also stock up on wings from dispensers and when your wing runs out mid flight (they have a limited lifespan based on distance travelled it seems), you can just pop another one and paraglide onto it and continue flying.
I've discovered construct heads recently which, with a beam emitter on top of them and the pairing used in place of a headlight on my hoverbike, make for a fun way to kite big bosses in the depths.
CYOA
Constructs are fun.