I actually have the exact same size/model!
Is the heat pad pressed flat against the tub or is there a fair bit of arch/lift between the pad and bottom of your tub around where the probe is attached? If that makes sense?
Because if the probe is lifting it the pad enough where there isn't much contact then that may explain why you need to run your uth so hot just to get through the plastic. I actually bumped into this issue but fixed it by placing thin, flat strips of styrofoam where I wanted more contact, just not on the probe head directly.
I'm using a pvc cage (Animal Plastics T12, pretty thick bottom) and have mine set to 96 to get the my hot spot (under substrate) at a steady 89-91.









! Yes, I have taped it down so there's no wiggly jiggle! I believe I got the 6x11, so only about 1/3 of the tank has the heater on the bottom
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