%17 is pushing the upper limits, that sugar get's completely converted to alcohol, so if your beer was mildly sweet at 1.010, all of that sweetness is still there...it is just accompanied by more alcohol now. I wouldn't be too worried about it. There is no doubt that raishing the temp "in the sun" probably caused your massive attenuation by heating up the fermenters and causing the yeast to go nuts.
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