UTH's do very little for your ambient temp. You need to get it hooked to a tstat and still use the heat lamp. A 60 watt may be alittle much. Put it on a dimmer or try a lower watt bulb to get the right temp.Put the UTH under the tank onthe warm side.

You want a warm spot at 90-94(surface temp) and the rest of the tank around 80(air temp). Having an ambient temp of 90 probably means the surface temps are to hot. This may be an inaccurate number though because it appears your probe is mounted near the top of the tank. Your probe for the surface temp should be on the surface you wish to know the temp and your ambient probe should be about an inch from the substrate at snake level.

You should have one hide on each side of the tank and I can't see the water, where is it?

When it refuses food wait about four days before trying to refeed. You can refreeze the f/t once after a refusal as long as it has not been thawed for hours, I personally don't let it go more than an hour.

I like to use a IR temp gun to make sure the surface temps are where I want them.