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I have been conducting similar coffee and caffeine experiments on myself for that last 5 years. I draw similar conclusions and prefer to use caffeine as a tool rather than a habit.
Worth noting, green tea still has caffeine just a lower dose. It’s good for reducing your intake if you can’t take cold turkey. Genetic analysis shows that caffeine has more of an impact on some people based on your genes so some people may need 2-3 cups to get the hit of your one cup.