Having three inches of fiber over the uth is wrong. It [should] be less than a quarter inch. Having as much as you do you have a good chance of insulating the heat and building a dangerous number if the snake was too [burrow] and reach it. Before you say "my snake doesn't [burrow]" that doesn't mean it won't.... One day. Reduced the fiber over the uth and get the temp to serve as a proper hotspot only. A uth is not meant to, nor will it, get your ambient temps where you want them.
I like thick substrate too. In my cage it's thick and then slopes off to the uth where you can see most of the uth. Then I put the hide over it too cover the area so you can't see it. This is in a 40gal tank I still use.
As to the light the bulb is fine. All you need to do is get a dimmer and reduce it's output. This will make the bulbs last longer as well. You need a IR temp gun to check the surface temps is the cage as those spot lights can really concentrate the heat creating unsafe hotspots. It may make the ambient temp good but be giving you hotspot way out of spec.
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