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 those of you who,use 16.7 grams of water. 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.
With blade grinder, ratio has an effect but the grind quality is definitely effecting more. I go with the 16.7 ratio for years with coarse grind and the coffee is really good every morning.
I’d suggest getting a good burr grinder. That has the biggest effect for getting a quality cup every morning.
Which burr grinder is a whole thread worth of a topic and hand crank vs automatic too