Actually, the 115 is very not good. This will turn into a thread about melted tub bottoms and "I almost started a fire".
Anything over 100 is not good and over 105 is very not good, especially since with the tub in place it is likely warmer than that.
When you measure your hot spot is that the bottom of the tub itself or is that on top of the substrate? What is your room temp at?
Back heat is a little different, the heat is not trapped between a shelf and a tub but can constantly radiate out, this is very seldom a problem running hotter BUT if you have to run it over 100 on hatchling tubs I will guess your room is on the cool side.
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