Sometimes, lowering the size of the cage will help to make them feel more secure.

Do you have two tight hides that are not log hides?

Before you switch to a smaller cage (or tub), try covering 3/4 of the cage in dark paper to make him feel more secure and make sure those hides are avaliable.

Also, sometimes snakes will not eat f/t, and you really have no choice but to give live a shot. Just keep an eye on him if you feed him live. Once you get him eating in general, he may be able to switch to your desired food type.

Good luck.