for your larger racks where your having the heat problem, you could add more heating element (another row of tape). and use this to adjust the heat level.
or
you could put the troublesome levels on their own dimmer/thermostat and just have them adjusted a part from the upper levels.
or
you could just raise the entire rack by putting it on a stand or something. i know this one might not work due to height issues with the rack and the celing.

i think the problem would lie in the fact that heat rises, and not only are the upper levels being heated by the bottom levels, your room itself (since you heat the room to your base temp) probably has a vertical temp. gradient.

just tryin to help since you guys have been helpin me.
i think i am going to end up building a 16 tub rack due to size for the first clutch, and have extra tubs if i need them, then build a second 16 tub rack after if i find the space nessicary and available. thanks again.

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