1/3 of the tub is fine. Break off a piece of plastic from another tub. Tape the probe to one side of the plastic, and the other side of the plastic to the flexwatt. This will give you a better idea of the actual temps inside of the tubs. Use a temp gun to dial it in perfectly. With balls, I like to keep temps around 92 on the hot side and 82 on the cool side.
Also, belly heat is much better than back heat, IMO. I have back heat on one of my 28 quart racks, and it runs at 100% constantly. My belly heat racks, on the other hand, usually only run at around 30%.
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