If I had severe mental illness I'd be immortal by now.
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If you can't do that, I've heard of people adding a sprinkle of baking soda as a buffer to black coffee. I'm not sure how much you'd need, probably just a tiny amount that you'd barely be able to taste.
Maybe it’s unrelated, all in my head, better beans, or the 3-4 oz of whole milk, but maybe give espresso drinks a try if you haven’t?