Thanks for sharing your progress. You mentioned cutting down on black tea. If tea is something you enjoy, one alternative might be to switch to either green tea or white tea which has even less caffeine than does green. And then, of course, there are also "tisanes" (herbal & flavored teas which have no caffeine at all.) One great source of a variety of teas & tisanes is: "Teasource". Here's a link to their website:

Tea Collection | TeaSource