I think you've done what you can do this point. Definitely get the temp gun or IR thermometer ASAP to verify the temperature over the UTH and keep him on paper substrate for the rest of his life. With that scarring I would move to a tub if he isn't in one already, this boy will need higher than normal humidity to shed out the scarred areas.
I would also suggest feeding a small rat every 10 days instead of a medium every two weeks if he won't switch over to frozen/thaw. At under 1000 grams he doesn't really need to be on mediums anyway.
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