Please use a good proportional thermostat such as herpstat, or helix.
Isn't your beloved pet/expensive morph worth it to pay little more for quality equipment?
In a rack, thermal gain will definitely build up. I would suggest a thermostat probe at each row, or (in addition to a proper thermostat) dimmers at each row so that you can dial it in to the same temp and compensate for thermal gain.
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