I don't get what you mean by stacks in combination with fluid and barrels.
A standard barrel has a capacity of 50 units of fluid and you can stack 10 barrels which are then 500 units of fluid in one stack
This mod provides bigger fluid containers like a pallet of barrels, an IBC tote or a steel container
A pallet of barrels has a capacity of 200 and you can stack 4 pallets, regardless if they are empty or filled, which gives you 800 units of fluid in one stack
A IBC tote has a capacity of 400 and you can stack 10 empty IBC tote or 3 filled IBC tote which gives 1200 units of fluid in a stack
A steel container has a capacity has a capacity of 900 and you stack 2 steel containers, regardless if they are empty or filled which results in 1800 units of fluid per stack
I cant follow your math with 10K 3.3K 2.5K stacks.
I also didn't change anything in this mod, i made it just usable for Factorio 2, so what is this "keep it consistent with the original version"?