From what I've heard, the Pagos items are guaranteed to drop, but only to one person who participates and gets a Gold in the FATE (so imagine 144 players being level 35 clearing the Cassie FATE. Only one will get the earring. It's dumb, yes).

Regarding the Optical Hat, I've heard it's not a guaranteed drop even if you have the Hakutaku eyes (though I think it still follows the same rules as the other items. So if you're the only one with Gold, then it's guaranteed, but if multiple people have the eyes, then it becomes a luck of the draw).

I agree that the items should be easier to get. Heck, Pagos overall needs to be made 'easier' if SE want people to enter Pyros.