Warmer hot spots in tubs higher in the rack and cooler towards the bottom? If so that’s normal temperature stratification as heat rises. Is this one continuous strip of heat tape or multiple strips/pads connected to one thermostat?
Depending on the design of the tub floors you may need to adjust up a bit to get the inside temp desired. I’d bet a board across the bottoms of those shelves would go a long way too.
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