I don't use this wax but am having the same problem with one FO... so far. I used between 8-9% of FO pp and am able to use 10. Candle was lit a few days after curing...fine. A few weeks later, after letting it to cure longer, I noticed that it had drops of liquid in it. Looked like a little bit of FO to me. But I though maybe I did that somehow. Wiped it off, let it sit. Nothing, a week or so later... again. Now I lit it and it's burning fine, and throw is fine. That's the only FO that's done that to me (stormwatch), so I think you might need to cut down on that particular FO's load too. Try leaving another one outside like suggested, and make another one with a dif. FO to compare. I don't doubt that the cold does funky things though, especially to soy. And I agree with Top, you can't treat all FO's the same, that's especially apparent in wicking and H/T.