Yep. imperfection is a feature not a bug.
Trying to eliminate every variable and be able to follow a precise formula is absurd. And if you manage to do that you are going to make food that is as good as what you can buy in the frozen section of any grocery store. That highly processed stuff is made by eliminating all the variables and following a precise formula.
Just enjoy the variation, taste your ingredients and food at every step you can and adjust until you like it.
3/2 makes sense as a way to represent how someone would actually say it out loud. "Three two beer" is common term used to describe beer with 3.2% alcohol by weight. "Three point two percent beer* works but is just shortened and 3/2 is a pretty good way of capturing the sound.