I had the same problem with the acidity.
A friend (who was a self-proclaimed coffee snob) said to try drinking espresso because it is a less acidic drink. But I wanted t something to sip on instead of taking espresso shots. So then he suggested having an Americano, which is shots of espresso with water. I tried it for a week straight then on the 6th day switched back to regular coffeee and the difference was night and day.
And now I have finally landed exclusively on green tea for my morning caff bump.