I have a few snakes that I had to soak multiple times to get the shed off, seems like it happens more on my retics than my balls or kings. I was soaking for 30 minutes in 90F water, it took four soaks to finally get the shed off of my SD retic a couple weeks ago. You may try a wet pillow case too. I'm still not sure why some sheds don't come off very well even when I keep the humidity up in the enclosures...