Your hot side seems a little low, especially if you're using a thicker substrate like aspen. What are your cold side temps at? Have you tried prescenting? I'd suggest talking to the breeder you got him from, any reputable/respectable breeder will want to make sure you're doing ok. Find out what he was eating, how often and if it was always a certain time of day. Also large differences in the enclosure size may lend to stress.