You will be fine as long as the watts are under the rated max watts. Just put the probe on the third from the top and you will be fine. Yes you will have a temp difference between tubs and that's normal. They all will not be the same temp. I have a Herp4 and it was running an eight tub rack I built with 6" thg heat tape. The top tubs were warmer than the bottom but that's normal as well no matter what thermostat you will use.
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