The problem with the variation that I see in my different batches is that there is no way to know which one is "right." Also, I don't know that my SCOBYs have truly changed, I was just speculating that the neglect I heap upon them may cause changes.
Sometimes, the brew tastes like it has a hint of honey, sometimes like apple juice. This often happens in the same batch of mini-brews. This makes me wonder how to more tightly adjust the KT culture, the amount of sugar and the amount of tea used.