Are your windows properly locked? I think for those windows design, if the lock isn't turned correctly, it doesn't push down properly and there isn't a proper window seal.
In your pictures, I see those lock levers in all sorts of directions. Could this be contributing to cold air seeping into the upstairs from the outside?
I was also told that in the first year of home ownership, the home "sweats more" so there might be more condensation in the first year of ownership (if you haven't tried dehumidifying it with an AC) as the moisture from the inside begins to seep out and disperse. I have no idea if this is actually true, or if someone was pulling my leg, but I do seem to recall having more condensation and ice on my windows in the first year than later years.
Agreed on the comment about having the blinds open. Airflow helps a lot to keep the condensation at bay. Occasionally grabbing a fan and pointing it at the window to evaporate the condensation helps to reduce the work of wiping several times in a row. Instead you can point the fan and just wipe the accumulated water once.
Another thing to do is play with the vents on the main floor and close the ones you don't need as much and see if there's deflectors in the vents in your basement that can divert more air to different floors. The pressure to the top might be a reason for the differential. My old place was like 1-2 degrees difference. 6 is too much.
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