Autos will start to flower automatically, hence their name. It doesn’t matter what lighting schedule they are on because they will flower only when they are ready to. I suggested you go to 12/12 because you weren’t sure what you had, still I don’t think it can hurt.
You think you have a small tent? Lol, I grow in a 2’x2’ tent setup in my master bedroom! My last grow I had three plants in there and harvested almost six ounces. They were regular fem seeds, not autos.
I forgot to mention the exhaust fan, it will definitely lower humidity by design. Try to keep it at it’s lowest setting and I would try the wet towel trick – I’m going to try that myself. Just hang a wet, white towel in the tent. Also, put a tray of water in there too, and make sure your plants aren’t sitting in the water. And keep spraying!