If I ever have stuck shed I take a tupperware with air holes at the top, and put a layer of warm water (enough to steam once you close the lid) and close them in there for about 10 minutes. Not too high though you don't want them swimming. If that doesn't work I put the into a pillowcase and let that sit in a thin layer of warm water. Don't overly soak the bag because they still need to breath. But the combo of warm water and rubbing against the fabric has worked every single time for me hands down
Besides that your snake seems extremely healthy and I wouldn't worry