My first suggestion that you might be doing or not doing I don't know is always take them out in the evening or night NOT the day time. I always let my snake alone in the day so it can get it's needed and wanted sleep.

I figure out which hide it is in and then I knock on it. I have the plastic black type like Reptile Basics sells. So when you knock the snake knows it is you. Slow is the main technique you want to use in handling. Slowly lift the hide up and set aside. Your BP will be most likely be curled up. I stroke the side gently then lift my snake slowly gently out.

Once I am holding the snake you might want to do no petting or caressing. Just hold it and let it do what it wants to do. I can now stroke or touch the snake but they are they're most comfortable if you don't touch them especially the head area and neck area. Light touching on the side near the middle might be OK for you but the best is to just hold and let the snake look around and explore. That helps soothe their fear.

Then keep handling to 15 min. max or shorter it the snakes darts about and shows you they want back in. I think your snake will eventually come around to your handling.