Just a couple of thoughts (excellent post there Judy...super advice!). Look at that from your little snake's point of view. That's a lot of open space to hunt in when you could be just as likely to be prey as predator exposed like that. Try the newspaper trick. I have a pic somewhere of it so I'll try to post what it looks like. Sometimes with a larger enclosure you could even take a piece of thick cardboard and temporarily divide the enclosure. This keeps the live prey on the same half as the snake but does not crowd them unduly. Never crowd a live prey into your snake's face. Please never restrain a live prey item either. It will make the prey panic and can cause it to be more aggressive towards the hunting snake. A healthy normal BP can handle an appropriately sized live prey item without any human help.
You may want to pre-scent the area. Put your live mice in a container with a lot of ventilation and sit them on top of the tank lid for 30 minutes minimum before you introduce on to the snake (I call this priming the pump lol). If you aren't feeding after dark, try that as it's the most natural time for your snake to be out hunting. You need to monitor all live feeds but don't hover over the enclosure as your snake will read you as a predator and won't likely hunt it's food.