Not sure about stirring, @StevePeel should be able to shed more light. Your ratio is actually higher, it's 0.094, whereas 18/200 is 0.09 so if you upped water to 200g you should put in 18.8g of coffee with your method.
I find it needs a stir as all the grinds have a tendency to float on top otherwise. Just a gentle agitation to get it all mixed freely.
@Scrabble started
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Not sure about stirring, @StevePeel should be able to shed more light. Your ratio is actually higher, it's 0.094, whereas 18/200 is 0.09 so if you upped water to 200g you should put in 18.8g of coffee with your method.