Glad you solved most of the problems. Usually, that kind of behavior comes from boredom. I used to seal off my room, making sure plugs and cords were out of reach, and let each of my hamsters have turns running around in my room for awhile most days. I should mention that each hamster 🐹 had its own cage.

I've also seen some very creative hamster homes with lots to do to stave off boredom. Google for ideas.