I'm the same. I once tried going cold turkey from four cups a day and my headaches were so bad I was useless for three days before I gave up and started drinking coffee again.
Today I'm still at about four cups a day. Similar to you, I use a Chemex instead of an automatic machine to slow my consumption.
I went cold turkey a couple months ago because I didn't like the afternoon headache and general feeling of uselessness that I'd suffer on days when it wasn't practical to get coffee. Nor was it pleasant to live with the very fact of a chemical dependency... I'm not quite as sharp in the morning on just chamomile, but afternoons and sleep are much improved.
Today I'm still at about four cups a day. Similar to you, I use a Chemex instead of an automatic machine to slow my consumption.