Unfortunately, we live in very different places and climates, so if someone from your general area chimes in on this thread, I would take their advice over mine.
If you have a super with no wax (drawn comb) on the frames at this time of year (early Fall), it is very unlikely that bees will build wax in that untouched box to store honey over the winter.
The weak colony will store honey in its brood box on the margins of the brood nest and in the exterior frames. The strong colony will do the same as well as in the one super you will be leaving on the hive. As to the amount of syrup to feed, I would feed slowly and monitor weight (just heft it up with your hand from the bottom) and how the frames are filling up in the brood nest for the next month or so. You don't want them to get honey bound too soon in the season and have a late swarm. Later, when the risk of swarming is over, you can apply syrup more liberally. That is sort of a feel thing that you will develop.
Additionally, don't feed one without feeding the other. That will often cause robbing, especially of the weaker hive. Restrict your entrances with entrance reducers to the smallest width to prevent robbing this fall
Again thank you for this info. Just one more the strong hives honey super is so full it takes two people to lift it. That is why I was going to leave a shallow super on that one so they have a place to put the syrup and pollen patties??? Is is such a big hive I was worried about a swarm so I wanted to give them the extra room. We will be in the 80s most of Sept and 60's in Oct. So there no chance of them building comb at this time???? I was going to give the weak hive pollen patties should I do the same with the strong hive? I am giving them both 2:1 at this time, should I give the strong hive the summer mixture since I have to feed both of them. Thank you again.