I just got a titanium. I raised the temp to high, the fourth of the five choices, from medium, the middle of the five. My wife thought that made the coffee taste more bitter. I guess if I raise the output temperature, which I like, that raises the coffee grind soaking/brewing temperature too. Is that true? Does that make the coffee more bitter? A workmate suggested I set the temp to Low and just put the cup in the microwave after, for the least bitter coffee. What's the relationship between the five temperature settings and the coffee taste/bitterness?