If you're the type who wants to dial in every cup, treat the AeroPress like a mini lab. Use a kitchen scale to weigh your coffee and water. Start with a 1:15 ratio (coffee to water), then adjust: if it's watery, increase coffee to 17 grams per 250 ml; if it's bitter, lower the temperature or shorten the steep. You can also vary the steep time from 1 to 4 minutes to see what you like. Keep a small notebook or note on your phone—track what you changed and how it tasted.