Glad you liked my teecino review
I can't help you with cutting coffee out, as I'd rather die than do that, but one thing you might want to try is taking your 12oz cup in the morning, and turning it into two smaller 6oz cups, one in the morning and another in the early afternoon. The "up and down" feeling you're describing is likely from having one big caffeine boost in the morning, then having withdrawal symptoms hitting you in the late afternoon or evening from that blast of caffeine wearing off all at once.
I drink ALOT of caffeine a day, mainly from coffee (no soda or anything for me, but I love "Ultimate Orange" as a preworkout drink!) probably enough to give most people on this board a heart attack, but I don't ever ingest a whole lot all at once,usually about 100mg, a single cup of coffee, at a time, or 200mg pre-workout for a real kick- more than 200mg at once doesn't feel pleasant to me, and I'm a 205-210lb guy who's been sneaking the stuff since I was 12
If you're keeping your overall intake as low as a 12oz cup of coffee a day, which is probably about 150-200mg of caffeine all day, don't beat yourself up so badly over it, that might be the main reason it's making you feel like crap