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To me, that sounds like pretty good care and setup.
My wife has kept her tiger salamander for over twenty years in similar conditions to yours, though she doesn't provide enough depth of substrate for hers to bury itself (maybe and inch, inch and a half of coco fiber). Hers gets a winter cool down of 4-6 months at ~60 F, but gets up to 72F in summer.
Judging by the preferred hiding spot of under the water bowl, I wonder if yours is looking for the coolest spot. If I were in your situation, I'd try to get him cooler for a week or so and see how he reacts. Do you have a basement you can move him to, just to see if that's what he's looking for?
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