What is your pourover ratio?

I am currently using 40g coffee to 500g water which is 12.5g coffee to 1g water but I have seen things like this https://www.olympiacoffee.com/blogs/blog/how-to-brew-like-olympia-coffee#:~:text=For%20those%20of%20you%20who,use%2016.7%20grams%20of%20water. which suggest using a little more. Does it even matter to adjust the ratio precisely if I don't have a precision grinder and am using a Krups blade grinder? I am trying to get things as precise as possible.