If you want more heat capacity, you can put back the clean tubs 1/3-full of water, or just throw a couple water bottles on that shelf.
(I'm now a convert to the 1/3-full tub of water in the incubator---I think it saved me from what would have been a very bad heat spike when my temperature probe came loose. Because in addition to more heat capacity, the water in the tub evaporates, which has a cooling effect. And the evaporating tub was between the fan/heat tape and the egg tubs. So even though the water bottles at the bottom got up to 98-99F, the temps only got up to 94-95F in the tubs before I noticed what was happening.)
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