Re: Almost zero stores in August... do they have a chance if I feed heavily?
There may be some honey stored around the perimeter of the brood frames. Certainly bees can survive a Wisconsin winter feeding on largely sugar. Whether your particular hive will, well there is only one way to find out, and that is to feed.
I suggest that you use approximately 2:1 syrup while the weather permits. That would be 5 lbs of sugar to 40 oz of water (5 cups of water).
--- Practical reality trumps philosophy!