I really enjoy the vaults on Siptah. One major issue we have is the double RNG for recipes in the cache at the end of the vault.
Given the fact that there are many recipes that can be obtained, the RNG on whether a recipe will drop or not is overkill. It would be plenty enough grind to defeat the RNG monster to obtain the recipe you actually want without the added randomness of obtaining a recipe at all.
Would it be too much of an ask to guarantee the recipe drops and keep the RNG at a singular level?