If you don't want to switch to another set up you need to make some changes. Those logs don't sound very secure for the snake, they like to be smashed up inside something, they don't like extra room in their hides.
These are all good hides or you can make your own:
http://www.thehognosesnake.co.uk/ima...ke_to_hide.jpg
Clutter up the tank, make it so he doesn't have a lot of floor space. You can add more hides, or crumpled newspaper.
OR Add a divider for the tank to make it smaller. I did this in my 20 long tank.
Leave it alone for a little while, about a week, then either put an adult hopper mouse, or a live adult very small mouse in it's enclosure and always supervise. You can sit there for a couple hours if you have too, sometimes it takes them a little while to get the idea then they will start taking it faster and faster.