Thanks for all the input. We have actually tried many configurations for his habitat. When he was in quarantine we had him in an Iris x-mas tree tub on paper with hides and belly heat. He seemed to do well with this, but when he did make a mess it got so wet and humid so quickly that his RI symptoms would start to come back. He has also been in the big Iris tub on substrate and is now in an AP T8 on cypress mulch with an RHP for heat.

I worry that he still has a latent infection and on our vet's orders we have been keeping his warm side a little warmer at 90 degrees to help him fight it off if it's still there. He's not currently drooling or exhibiting symptoms, but his "bad attitude" has remained in every enclosure configuration since around the time he first had the RI.