Hmm, I hadn't considered the volume of a wine bottle. I thought it was about 3 12 oz to one. Then again, I aeate well so I may be getting closer to the +1-2% you mention. It tastes very sweet and you can just feel it it very potent. So by what you are saying it sounds like I got 16% or so out of it. I have my current batches readings, once they are in the bottle I will need to take another hydormeter reading again. I just wondered if altatude had anything to do with it.