I use the Sterlite gasket tubs with the 11x11 Ultratherm heat mats. My probe is taped to the wood base, the uth taped in place over the probe, and the tub sits on top. Depending on where in the stack it is, my thermostats are set from 90-92F to get a hot spot of 88-90F. I haven't had any issues with the tub temps from the small gap.
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