Like I said in another thread, the Armoury Exhange could do with more Curios for sale at any given time. It could easily be doubled to 4 curios, or even tripled to 6 curios for sale. We’d still deal with the RNG, but getting those high tier items would be a bit less time consuming.
Another option would be the ability to upgrade Curios the same way we do weapons. We can already change the perks for better ones.