Heat tape is controlled in watts per foot. Different width tapes have different watts per foot. Different brand tapes have different watts per foot.
Example:
Thg 4" tape is 6 watts per foot.
So if one rack has 10' of tape it will pull 60 Watts.
The next rack has 5' of tape it will pull 30 watts.
If you put your probe on the rack that uses 10' then the rack with only 5' will run much hotter.
Your best option is to run a different stat for each rack. But as an alternative you could simply use the same length, width and brand of heat tape on both racks. Even if one of the racks has extra tape running out the side of it. At least this way both strips of heat tape will be pulling the same wattage and therefore run at the same temps.
I personaly secure my probes from the stat directly to the heat tape and then set my heat higher so the heat in the bin is where I want it.
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