Your humidity is way too low! Put the snake in a closed Sterilite tub with a couple inches of water for 30 minutes or so. That will loosen the shed.

Your BP will normally need humidity levels around 55 - 60%. During shed it needs to be bumped up to 70%.

What is your set up like? Do you have a thermometer/hygrometer to measure temps and humidity? What are you using for heat?