Welcome to the forums.
Sounds like things are going well for you. I would suggest you start monitoring varroa mites, as this is the time of year I start seeing a surge in the numbers.
I personally like to have 2 deeps for brood, but since the season is starting to wind down, if you haven't had any swarming or signs of swarming, they must have enough room.
As long as you have kept empty supers on top, they could move the honey up if they wanted more brood room.
Next year I would recommend putting your supers on earlier so that they don't store in the second deep. As long as the supers have drawn comb, I add two to start, and keep adding additional when they start working the last empty one. Basically always have one completely empty super. This assures they always have room if a heavy flow hits, and also gives them more room to dry nectar. There is really no reason not to give them extra room if you have the drawn comb. It is perhaps the easiest swarm prevention there is.
There are many debates about swarming here in the forums, but if your intention is maximize your honey take, you want as many bees in the hive as possible.
Where abouts in Connecticut are you? I'm in Ulster County, NY and work in Dutchess County.
BTW, you might want to check out the beeking course on this sitehttp://www.beemaster.com/honeybee/beehome.htm
There is a lot of good information there. But don't hesitate to use the forums if you have any questions. We're really just a nice bunch of hobbyist like yourself