How to check and adjust fluid level of custom fluid block

I have a procedure where i am replacing vanilla water with my own custom water and trying to adjust the level in increments using a procedure but i cant seem to find a way to adjust the correct property of the custom fluid block right now my procedure code looks like this
https://pastebin.com/t4PiHn52 (i might also upload the ptpl file if i can)
i am using mcreator 2025.1 with neoforge 21.4.123 generator
just to be clear the problem isnt that the procedure is doing something wonky the problem is its not working at all (i know this because printed return values are always using fallback values