It is important to remember that when setting up your thermostat, and dialing in temperatures, you want to be adjusting the hot spot temps, not relying on measuring ambient temps. Depending on a given setup, getting your ambient temps into the 80s means having a hot spot that is dangerously hot. Measure the hot spot, get it to around 90, and leave it alone. With an insulated rack, the appropriately sized heat tape, and an appropriately heated room, a 90 degree hot spot will get your ambient temps to the correct levels. If your heat tape is too small, or your room too cold, the heat tape will have to work too hard to get the temps up.
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