So my rack came today with my VE-100 Thermostat and everything is looking good. My room can be a bit cold at times, ambient temp about 70, the heat tape is set to 92 degrees and the inside of the tubs reach around 85 degrees.

My questions is about the hysterisis, what should I set it at? 3? 0? I was a bit confused about that. And should I heat it up a bit more? make the hot side around 87?