I'm using 60g/L, the best ratio in my opinion. I grind it using Timemore C2 and brew it using Hario Switch.
15 grams of water to 1 gram of beans normally. I might adjust it a little depending on the bean.
You reversed your coffee and water in the 12.5:1 portion.
Measuring is important for repeatability but getting a good grinder should be your highest priority. A Timemore C2 will be a huge improvement over the blade grinder. You should be able to find one for around $60 most places.
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