I agree that you don't need to move the ball python for feeding but if you must do it I would gently slide the snake out of the tub onto a table or some other surface then pick them up to put them back in the cage. That's what I did a long time ago with my albino california kingsnake snake. Had the same issues as you and this was when they told you to feed in a separate container. Once I had her out of the box it was no issue picking her up and putting back in the cage.