Re: combining two hives?
You need to go out and look @ them. I am not familiar with your nectar flows, ie. What's blooming out there, but they should be bigger than that. If they were that full the last time you looked. Then you should've added supers to each. As much as 2 supers each. Go check them and take along a couple supers just in case. As long as there are flowers still blooming. They will keep bringing in stores. Let us know what you find and then we can be better help to you.
Ralph Waldo Emerson "To map out a course of action and follow it to the end requires courage". John 3;17