I think it's your bulbs that are the problem, I'd drop the bulbs and go with an under tank heater on one side of the tank on a thermostat set to 88F. The way I have my tubs setup in my rack are that I don't have any substrate over a small area of the hotspot, the substrate is much cooler and messes up the hot spot, you have to turn it up to get the right temp and if they dig down it's too hot, so I keep it substrate free in one spot just big enough for the snake over the hotspot. They will usually just hang out in that small spot most of the time. I'd keep the room mid to high 70's if you can. I'd also drop the Coconut fiber and go with Coconut husk, the fiber doesn't hold water at all. When I bought my SD retic he was in a cage with bulbs and he was in a major stuck shed. Since I switched to an under tank heater and coconut husk substrate his sheds are perfect and he is not as mean as he was, I'm pretty sure the bulbs were stressing him out.
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