You can feed him once a week am appropriate sized prey item. Something about as big as the girth of the snake.
Regular soaking is basically what you can do to try and get the shed off. I have sometimes seen items for sale tht are supposed to help stuck shed. Never buy them. Water works jut the same.
Try soaking a couple times a day and work at the shed. You don't wanna over do soaking too often because that can just lead to other problems.
It can be a slow process.
If the shed is as bad as it sounds it might not eat right now just to give you a heads up.
Got any pics to see how bad the shed is?