Carol,
This late in the year, I think, all you can do is feed the hives.
I have found that 2 or more hives gives you comparisons for learning.
Earlier in the year i had the same problem and added a brood frame to the weaker hive from the stronger hive. It was a remarkable improvement. I decided to feed both hives as well. I would not add a brood frame now but you might get other opinions with more experience than mine.
Joe