Heat problems again

Hello everyone. We have a ten tub rack using flexwatt as heating source all on the same thermostat same size FW same size tubs.Same everything.The lower tubs are good but the upper tubs are running low 86,88,89.If I raise the temp the bottom tubs will get way to hot. very confused. The rack is closed on all sides except the front Any help?
Thanks Mike.

Where is the thermostat probe? You should put it right on the flexwatt of the middle shelf.

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Originally Posted by Kaorte

Where is the thermostat probe? You should put it right on the flexwatt of the middle shelf.

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I know it is on the FW not sure what shelf.I will go look right now.
Thank You! Mike

Just checked it was on the second shelf so i moved it to the middle..
Thanks again Mike.

I don't understand but that seems to have worked. I didn't even have to adjust the temp.They are all right on now.
Thank You. Mike.