I would personally lower the cool side a wee bit if possible. 86 seems warm to me... But that's up for debate. (we keep ours at 80-81)
Also, he may still be hiding in his water bowl because that's all he knows for security so far. I find sometimes my new babies have no clue what the dark hide is or what it's for.
In the meantime, I would clutter up his cage.
When I get home I will adjust the cool side temp to see if that has any positive affect. I have more plants I can throw in there too, so I will do that as well.