I'd chuck the sticks and only use the liquid test tube tests such as the API. Kudos for you to try so many different things. If I had to guess, something is up with your water, they don't like it. But it's a guess that must be troubleshot and eliminated by you.
I am afraid at this point it is way too late. They will not feed and die. I am saying this because baby pima under 5" are extremely fragile in that they must eat every day to survive. Usually the sender fasts them at least 2 days before shipping, then one whole shipping day, then you get them and it is crucial to get them to eat something right away, same day, because for say a 3" pima it will be too late tomorrow. Such small pima have no reserves to survive more than 2-3 days without feed.
My advice - never buy baby pima under 5", it's too much risk.