Enjambres here!
I am in northern Rensselaer County, in the colder section of the county (not as cold as up on the Plateau, though.)
You need to get that half-super filled with syrup ASAP - a half super is not a good thing to have on the hive this late in the season. This is an unexpectedly good week to do that. Be sure to have robber screens on while feeding to avoid issues. (Keep the robber screen on until you replace it with a mouse guard.)
Do you know how much your hive weighs? Even though it is full of drawn comb, there can sometimes be surprising amount of empty space inside, which is why counting the number of box/frames is best complemented with getting a total hive weight which helps you know whether they are filled or not. Around here I would want a full-sized colony to weight a minimum of 120-130 lbs. My personal minimum (because I am a worry-wort) is 150 lbs but that's probably overkill
Beyond that, you have covered one of the most important wintering basics: mite treatment in late summer. Did you test afterward to make sure you had - and still have - low numbers? I also do a single round of OAV in December when the colony is broodless to get a final clean-up of the mites until the following summer.
I use a fabric-floored, shavings-filled quilt box with a shim below (feeding rim and upper entrance) and a shim above (vent shim to the outdoors) to control moisture in winter, as well as 1.5" in of foam insulation.
I surround my hive with 2"-4" of foam insulation held in place with ratchet straps.
I use wind baffles in front of my (very reduced) entrances.
If you're up at this end of the county, maybe you'd like to come and visit my apiary some time soon to see my winter preps?
Also do you belong to SABA (the local bee club)? If not may I invite you to our next meeting? It's free and in Ballston Spa on the third Monday of November, at & pm at the Cooperative Extension building. I am the club's librarian so if you come, please come over and say hi to me at the book table. Our website is:
www.adirondackbees.org
The first thing I'd do, today, is getting half a gallon of 2:1 syrup on the hive and see if you can get them to take syrup every day for the next week. Put a robber screen on at the time; it will keep your hive safe now that the foraging season is over, and protect against field mice in the meantime. Every gallon of syrup will boost your hive weight by 9 1/2 lbs, and fill a couple or three of those empty medium frames.
And of course, welcome to Beesource!
Enj.