What size enclosure is he in and what type of hides are you using?
If he is in a 20 gallon that is much too large and needs to be moved to a 10 gallon at least.
Log hides are stressful and insecure, you need to use small tight hides that touch him on all sides of his body when he's in them.
Do you have rats available? It's always good to try different food sources. Some may like rats over mice or mice over rats. ASFs would also be very good and better in size.