Perhaps! The places around here are starting to sell super small rats nowadays... maybe a rat pup will entice him?
1.2 Normal
1.1 Red-tail
0.1 Albino corn
You could try that. I would just slowly work your way up in prey size. Maybe two weeks at one size, then move up and do a couple feeds at the next size up. Snakes go off feed for months at a time, and the fact that he is eating is a good sign.