>>544635897
>>544636750
>>544641824
Took all afternoon but I got it. Thanks for the help.
For (1) : Set all blue chest variables to 1 and use the formula you want. I got something that doesn't stockpile a million ingredients and works for all craft times.
For (2) : Use a condition with < 4 (for example) and tick the "parameter" checkbox

So now when I place the blueprint it asks me the item and the stockpile. Mission accomplished