Feeling very confused about ratios
For context, I've been toying around with pour overs for a few years now. I usually use a single cup drip machine because it's just so convenient, but I do grind my own beans. Pour overs are more of a weekend thing for me when I have extra time in the mornings.
Now the thing that has always confused me is ratios. I see 1:12 or 1:15 often touted as the golden ratios, with some people preferring somewhere in between or just slightly more diluted. However, when I try using these ratios, the coffee comes out like absolute rocket fuel. Just way too strong to the point where I think the majority of casual coffee enjoyers would not like it at all. Definitely stronger than I've ever had at a cafe or diner. A more palatable cup of coffee seems to be as low as half of that ratio to a third of that ratio to me, and it doesn't come out watery.
I do prefer darker roasts, which means I'm usually using lower brew temps (~195 F) as well.
I just recently got a V60 kit that comes with a pre-measured spoon that's supposed to contain about 12 grams of grounds. Here's where I'm starting to wonder if I'm doing something wrong and somehow misunderstanding ratios:
The carafe that the V60 came with is intended for up to six cups. However, if I were to put six Hario-sized spoonfuls of grounds into the V60, I think it would be damn near filled up to the rim or even overflowing. Surely that's not right, right? A solid "pot" of coffee with the V60 for my girlfriend and I according to our tastes comes from dumping two Hario-sized spoonfuls of grounds into the V60 and then filling it up to the 6 cup line, which is ~720 ml.
I guess my question is: where could I be misunderstanding ratios? Is there a likely culprit for why my coffee comes out overwhelmingly strong when I do a 1:12 or 1:15 ratio? Or have I just grown up in some weird microcosm where everyone is brewing extremely weak coffee, coffee shops and diners included, and it's what my taste buds are accustomed to?
Edit: To clarify, I do typically use scales. I've only been playing around with the volumetric scoop that the V60 came with for like a week now, and figured the anecdote about how six scoops would nearly overfill it might be helpful context in determining what I'm doing wrong.