1. Yes, normal.

2. Put damp moss in your hides. This gives the snake the humidity it needs without having to make the entire tank more humid. Damp towels on screen lids cause them to rust.

3. Reduce their stress and make their home perfect. Then proper heat the meal and deliver in a quiet and stress free manner. Tip: a mouse has a body temp just over 100F so the freeder temp needs to mimic that.