I have a gallon of apple/pomegranate mixed juice in my jug, used red star champagne yeast. No added sugar, OG was 1.049ish just like yours. I've always heard that champagne yeast ferments super fast, but I'm 4 weeks into it and I'm still seeing bubbles rise to the top. The cider is clearing up nice too. Temperature has been very similar to yours as well. Maybe it's the cooler temp. that's slowing it down?